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The Skewed Crossing sign may be used at a skewed highway-rail grade crossing to warn drivers that the railroad tracks are not perpendicular to the highway. If the Skewed Crossing sign is used, the symbol should show the direction of the crossing (near left to far right as shown in Figure 8B-5, or the mirror image if the track goes from far left to near right). If the Skewed Crossing sign is used where the angle of the crossing is significantly different than 45 degrees, the symbol should show the approximate angle of the crossing.

Skewed Crossing, Outline

The Skewed Crossing sign may be used at a skewed highway-rail grade crossing to warn drivers that the…

The Skewed Crossing sign may be used at a skewed highway-rail grade crossing to warn drivers that the railroad tracks are not perpendicular to the highway. If the Skewed Crossing sign is used, the symbol should show the direction of the crossing (near left to far right as shown in Figure 8B-5, or the mirror image if the track goes from far left to near right). If the Skewed Crossing sign is used where the angle of the crossing is significantly different than 45 degrees, the symbol should show the approximate angle of the crossing.

Skewed Crossing, Silhouette

The Skewed Crossing sign may be used at a skewed highway-rail grade crossing to warn drivers that the…

The sense of taste enables us to test in some degree the chemical constitution of substances we take into the mouth as food. These organs are located in the mouth or on the mouth parts. This example shows a vertical section of large papilla on the tongue of a calf detailing the taste buds

Sense of Taste

The sense of taste enables us to test in some degree the chemical constitution of substances we take…

The M1 Garand (officially the United States Rifle, Caliber .30, M1) was the first semi-automatic rifle to be generally issued to the infantry of any nation. In 1936, it officially replaced the bolt-action M1903 Springfield as the standard service rifle of the United States Armed Forces and was subsequently replaced by the selective-fire M14 in 1957. However, the M1 continued to be used in large numbers until 1963 and to a lesser degree until 1966.

M1 Garand Rifle

The M1 Garand (officially the United States Rifle, Caliber .30, M1) was the first semi-automatic rifle…

The M1 Garand (officially the United States Rifle, Caliber .30, M1) was the first semi-automatic rifle to be generally issued to the infantry of any nation. In 1936, it officially replaced the bolt-action M1903 Springfield as the standard service rifle of the United States Armed Forces and was subsequently replaced by the selective-fire M14 in 1957. However, the M1 continued to be used in large numbers until 1963 and to a lesser degree until 1966.

Browning Automatic Rifle

The M1 Garand (officially the United States Rifle, Caliber .30, M1) was the first semi-automatic rifle…

"KNIGHT AND BARONET. A degree of honour next to a baron, created by King James I. to induce the English gentry to settle in the province of Ulster. The title is knight and baronet; it is hereditary: the arms are distinguished by an augmentation of a human hand gules, generally borne on an escutcheon in the centre of the shield." -Hall, 1862

Knight and Baronet of King James I

"KNIGHT AND BARONET. A degree of honour next to a baron, created by King James I. to induce the English…

"fig. 25 - Topography of a Bird. 1, forehead (frons). 2, lore. 3, circumocular region. 4, crown (vertex). 5, eye. 6, hind head (occiput). 7, nape (nucha). 8, hind neck (cervix). 9, side of neck. 10, interscapular region. 11, dorsum, or back proper, including 10. 12, notaeum, or upper part of body proper, including 10, 11, and 13. 13, rump (uropygium). 14, upper tail-coverts. 15, tail. 16, under tail-coverts (crissum). 17, tarsus. 18, abdomen. 19, hind toe (hallux). 20, gastraeum, including 18 and 24. 21, outer and fourth toe. 22, middle and third toe. 23, side of the body. 24, breast (pectus). 25, primaries. 26, secondaries. 27, tertiaries; nos. 25, 26, 27 are all coverts. 28, primary coverts. 29, alula, or bastard wing. 30, greater coverts. 31, median coverts. 32, lesser coverts. 33, the "throat," including 34, 37, 38. 34, jugulum or lower throat. 35, auriculars. 36, malar region. 37, gula, or middle throat. 38, mentum, or chin. 39, angle of commissure, or corner of mouth. 40, ramus of under mandible. 41, side of under mandible. 42, gonys. 43, apex, or tip of bill. 44, tomia, or cutting edges of the bill. 45, culmen, or ridge of upper mandible, corresponding to gonys. 46, side of upper mandible. 47, nostril. 48, passes across the bill a little in front of it base." Elliot Coues, 1884

Topography of a Bird

"fig. 25 - Topography of a Bird. 1, forehead (frons). 2, lore. 3, circumocular region. 4, crown (vertex).…

"Fig. 26 - Parts of a Bill. a, side of upper mandible; b, culmen; c, nasal fossa; d, nostril; e(see below); f, gape, or whole commissural line; g, rictus; h, commissural point or angle of the mouth; i, ramus of under jaw; j, tomia of under mandible (the reference lines e should have been drawn to indicate the correct tomia of upper mandible):k, angle of gonys; l, gonys; m, side of under mandible; n, tips of mandibles." Elliot Coues, 1884

The Parts of a Bird Bill

"Fig. 26 - Parts of a Bill. a, side of upper mandible; b, culmen; c, nasal fossa; d, nostril; e(see…

"Goniometer. An instrument for measuring solid angles, or the inclination of planes, particularly the angles formed by the faces of crystals." -Whitney, 1911

Hand Goniometer

"Goniometer. An instrument for measuring solid angles, or the inclination of planes, particularly the…

"Goniometer. An instrument for measuring solid angles, or the inclination of planes, particularly the angles formed by the faces of crystals." -Whitney, 1911

Reflection Goniometer

"Goniometer. An instrument for measuring solid angles, or the inclination of planes, particularly the…

"Fig 27. - Bones of the right wing of a duck, Clangula islandica, A, shoulder, omos; B, elbow, ancon; C, wrist, carpus; D, end of principal finger; E, end of hand proper, metacarpus. AB, upper arm, brachium; BC, fore-arm, antibrachium; CD, whole hand or pinion, manus; composed of CE, hand proper or metacarpus, excepting d2; ED, or d2, d3, d4, fingers, digits, digiti, h, humerus; rd, radius; ul, ulna; sc, outer carpal, scapholunare or radiale; cu, inner carpal, cuneiforme or ulnare; these two composing wrist or carpus. mc, the compound hand-bone or metcarpus, composed of three metacarpal bones, bearing as many digits - the outer digit seated upon a protuberance at the head of the metacarpal, the other two situated at the end of the bone. d2, the outer or radial digit, commonly called the thumb or pollex, composed or two phalanges; d3, the middle digit, of two phalanges; d4, the inner or ulnar digit, of one phalanx d2 is the seat of the feathers of the bastard wing or alula. D to C (whole pinion), seat of the flight feathers called primaries; C to B (fore-arm), seat of the secondaries; at B and above it in direction of A, seat of tertiaries proper; below A, in direction of B, seat of scapularies (upon pteryla humeralis), often called tertiaries. The wing shown half-spread: complete extension would bring A B C D into a right line; in complete folding C goes to A, and D to B; all these motions nearly in the plane of the paper. The elbow-joint and wrist are such perfect hinges, that, in opening or closing the wing, C cannot sink below the paper, nor D fly up above the paper, as would otherwise be the effect of the pressure of the air upon the flight-feathers. Observe also rd and ul are two rods connecting B and C; the construction of their joining at B and C, and with each other, is such, that they can slide lengthwise a little upon each other. Now when the point C, revolving about B, approaches A in the arc of a circle, rd pushes on sc, while ul pulls back cu; the motion is transmitted to D, and makes this point approach B. conversely, in opening the wing, rd pulls back sc, and ul pushes on cu, making D recede from B. In other words, the angle A B C cannot be increased or diminished without similarly increasing or diminishing the angle B C D; so that no part of the wing can be opened or shut without automatically opening or shutting the rest..." Elliot Coues, 1884

The Bones of the Right Wing of a Duck

"Fig 27. - Bones of the right wing of a duck, Clangula islandica, A, shoulder, omos; B, elbow, ancon;…

Illustration used to prove "Two angles whose sides are perpendicular each to each are either equal or supplementary."

Angles With Perpendicular Sides Are Equal or Supplementary Proof

Illustration used to prove "Two angles whose sides are perpendicular each to each are either equal or…

Illustration used to prove "An exterior angle of a triangle is equal to the sum of the two remote interior angles."

Exterior Angle Proof

Illustration used to prove "An exterior angle of a triangle is equal to the sum of the two remote interior…

Illustration used to prove "The sum of all the angles of any polygon is twice as many right angles as the polygon has sides, less four right angles."

Sum of Interior Angles of a Polygon Proof

Illustration used to prove "The sum of all the angles of any polygon is twice as many right angles as…

Illustration used to prove "If the sides of any polygon are prolonged in succession one way, no two adjacent sides being prolonged through the same vertex, the sum of the exterior angles thus formed is four right angles."

Sum of Exterior Angles of a Polygon Proof

Illustration used to prove "If the sides of any polygon are prolonged in succession one way, no two…

Illustration used to prove the theorem "Two parallelograms are equal if two sides and the included angle of one are equal respectively to two sides and the included angle of the other."

2 Equal Parallelograms

Illustration used to prove the theorem "Two parallelograms are equal if two sides and the included angle…

Illustration used to show "The two perpendiculars to the sides of an angle from any point in its bisector are equal."

Perpendiculars To The Sides Of An Angle

Illustration used to show "The two perpendiculars to the sides of an angle from any point in its bisector…

Illustration used to show "The two perpendiculars to the sides of an angle from any point not in its bisector are unequal."

Perpendiculars To The Sides Of An Angle

Illustration used to show "The two perpendiculars to the sides of an angle from any point not in its…

Illustration used to prove "The bisectors of the angles of a triangle are concurrent in a point which is equidistant from the three sides of the triangle."

Angle Bisectors In A Triangle

Illustration used to prove "The bisectors of the angles of a triangle are concurrent in a point which…

Illustration used to prove "The perpendicular bisectors of the sides of a triangle are concurrent in a point which is equidistant from the three vertices of the triangle."

Perpendicular Bisectors In A Triangle

Illustration used to prove "The perpendicular bisectors of the sides of a triangle are concurrent in…

Illustration used to show "If one acute angle of a right triangle is double the other, the hypotenuse is double the shorter side."

Relationships In A Right Triangle

Illustration used to show "If one acute angle of a right triangle is double the other, the hypotenuse…

Illustration used to show the various parts of a triangle: sides, angles, medians, altitudes, bisectors, and segments.

Parts Of A Triangle

Illustration used to show the various parts of a triangle: sides, angles, medians, altitudes, bisectors,…

Illustration of a circle with central angle AOB.

Central Angle in a Circle

Illustration of a circle with central angle AOB.

"Cross Crosslet on Grieces. GRIECE. In heraldry, a degree or step, as one of the steps upon which crosses are sometimes placed." -Whitney, 1911

Cross Crosslet on Grieces

"Cross Crosslet on Grieces. GRIECE. In heraldry, a degree or step, as one of the steps upon which crosses…

"Griffe from Vézelay. GRIFFE. In medieval architecture, from the eleventh to the fifteenth century, an ornament on the bases of pillars, connecting the torus with each angle of the plinth." -Whitney, 1911

Griffe

"Griffe from Vézelay. GRIFFE. In medieval architecture, from the eleventh to the fifteenth century,…

"Griffe from Poissy; end of 12th century. GRIFFE. In medieval architecture, from the eleventh to the fifteenth century, an ornament on the bases of pillars, connecting the torus with each angle of the plinth." -Whitney, 1911

Griffe

"Griffe from Poissy; end of 12th century. GRIFFE. In medieval architecture, from the eleventh to the…

"Medieval Groins in early 12th century vaulting. A, A, groins. GROIN. In architecture, the curved intersection or arris of simple vaults crossing each other at any angle." -Whitney, 1911

Groin Vault

"Medieval Groins in early 12th century vaulting. A, A, groins. GROIN. In architecture, the curved intersection…

Illustration of a circle with center O and diameters AB and CD perpendicular to each other.

Circle With 2 Perpendicular Diameters

Illustration of a circle with center O and diameters AB and CD perpendicular to each other.

Illustration of a circle that can be used to show that an "angle at the center of a circle is measured by its intercepted arc."

Central Angles and Arcs in a Circle

Illustration of a circle that can be used to show that an "angle at the center of a circle is measured…

Illustration of a circle that can be used to show that an "angle at the center of a circle is measured by its intercepted arc." Angle AOB and angle COE are commensurable.

Central Angles and Arcs in a Circle

Illustration of a circle that can be used to show that an "angle at the center of a circle is measured…

Illustration of a circle that can be used to show that an "angle at the center of a circle is measured by its intercepted arc." Angle AOB and angle COE are incommensurable.

Central Angles and Arcs in a Circle

Illustration of a circle that can be used to show that an "angle at the center of a circle is measured…

Illustration of a circle with an inscribed angle that can be used to prove that "An inscribed angle is measured by one half of its intercepted arc." In this case, one side of angle ABC passes through the center of the circle.

Inscribed Angle in a Circle Proof

Illustration of a circle with an inscribed angle that can be used to prove that "An inscribed angle…

Illustration of a circle with an inscribed angle that can be used to prove that "An inscribed angle is measured by one half of its intercepted arc." In this case, center O lies within angle ABC.

Inscribed Angle in a Circle Proof

Illustration of a circle with an inscribed angle that can be used to prove that "An inscribed angle…

Illustration of a circle with an inscribed angle that can be used to prove that "An inscribed angle is measured by one half of its intercepted arc." In this case, center O lies outside angle ABC.

Inscribed Angle in a Circle Proof

Illustration of a circle with an inscribed angle that can be used to prove that "An inscribed angle…

Illustration of a circle used to prove "All angles inscribed in the same segment are equal."

Angles Inscribed in the Same Segment Circle Proof

Illustration of a circle used to prove "All angles inscribed in the same segment are equal."

Illustration of a circle used to prove "Any angle inscribed in a semicircle is a right angle."

Right Angles Inscribed in Semicircle Proof

Illustration of a circle used to prove "Any angle inscribed in a semicircle is a right angle."

Illustration of a circle used to prove "Any angle inscribed in a segment less than a semicircle is an obtuse angle."

Obtuse Angles Inscribed in Circle Proof

Illustration of a circle used to prove "Any angle inscribed in a segment less than a semicircle is an…

"Passerculs bairdi. Baird's Savanna Sparrow. Inner secondaries less elongated, rarely equaling the primaries in the closed wings. First 4 quills about equal and longest. Hind toe and claw about equaling the middle toe and claw, its claw about equaling the digit. Tail shorter than wing, lightly double-rounded (central and outer pair of feathers both little shorter than the intermediate ones). Top of head streaked with black and rich brownish-yellow. or buff, the former predominating laterally, the latter chiefly as a median stripe, but also suffusing the nape and sides of head in greater or less degree. Back varied with brownish-black and gray, together with a little bay, the two latter colors forming the edgings of the interscapulars. Rump variegated with gray and chestnut-brown, different in shade from that of the back. Under parts dull white, usually with a faint ochrey tinge on the breast, but often without; a circlet of small, sharp, sparse, dusky streaks across the breast, continuous with others, longer and mostly lighter, along the whole sides, and with others, again, extending up the sides of the neck into small vague maxillary and aurigular markings. When the feathers are perfectly arranged these lateral head-markings are seen to be post-ocular stripe just over the auricular spot, a streak starting from the angle of the mouth, and another heavier one parallel with and below this, running directly into the pectoral ones. Quills without special marking, excepting the elongated inner secondaries, which correspond with scapulars. Tail the same, slightly whitish-edge. Upper mandible mostly dark, lower pale. Feet flesh-colored." Elliot Coues, 1884

Baird's Sparrow

"Passerculs bairdi. Baird's Savanna Sparrow. Inner secondaries less elongated, rarely equaling the primaries…

"A, symphysis menti; B, angle of jaw; C, body or horizontal ramus; D, coronoid process; E, ascending ramus; F, condyle; the teeth inserted along the alveolar border. The concave line between D and F is the condyloid notch." -Century, 1889

Lower Jawbone of Man

"A, symphysis menti; B, angle of jaw; C, body or horizontal ramus; D, coronoid process; E, ascending…

"Melospiza fasciata. Song Sparrow. Silver-tongue. Below, white, slightly shaded with brownish on the flanks and crissum; with numerous black-centred, brown-edged streaks cross breast and along sides, usually forming a pectoral blotch and coalescing into maxillary stripes bounding the white throat; crown dull bay, with fine black streaks, divided in the middle and bounded on either side by ashy-whitish lines; vague brown or dusky and whitish markings on sides of the head; a brown post-ocular stripe over the gray auriculars, and another, not so well defined, from angle of mouth below the auriculars; the interscapular streaks black, with bay and ashy-white edgings; rump and cervix grayish-brown, with merely a few bay marks; wings with dull bay edgings, the coverts and inner quills marked like the interscapulars; tail plain brown, with darker shaft lines, on the middle feathers at least, and often with obsolete transverse wavy markings. Very constant in plumage, the chief difference being in the sharpness and breadth of the markings, due in part to the wear of the feathers. In worn midsummer plumage, the streaking is very sharp, narrow, and black, from wearing of the rufous and whitish, especially observable below where the streaks contrast with white, and giving the impression of heavier streaking than in fall and winter, when in fresher feather, the markings are softer and more suffuse. The aggregation of spots into a blotch on the middle of the breast is usual. Bill dark brown, paler below; feet pale brow." Elliot Coues, 1884

Song Sparrow

"Melospiza fasciata. Song Sparrow. Silver-tongue. Below, white, slightly shaded with brownish on the…

"General arrangement of Apron Conveyor for loading vessels, pans are 48 inches wide, 12 inches pitch, attached to chains working over sprockets at 24 fee centers. Capacity of conveyor is about 250 tons of coal per hour, material being received from a 42 inch M. & G. belt conveyor. The Apron Conveyor will work at any angle, the outer end being raised or lowered to suit vessel." -Meese, 1913

Apron Pan Conveyor

"General arrangement of Apron Conveyor for loading vessels, pans are 48 inches wide, 12 inches pitch,…

An illustration of a angle's face and wings doodad.

Angel with Wings Doodad

An illustration of a angle's face and wings doodad.

"Zamelodia. Song Grosbeak. Bill extremely heavy, with the lower mandible as deep as the upper or deeper, the commissural angle strong, far in advance of the feathered base of the bill, the rictus overhung with a few long stiff bristles. Wing with outer 4 primaries abruptly longer than 5th. Tail shorter than wing, even or scarcely rounded. Feet short and stout. Embracing two larger species, of beautiful and striking colors, the sexes dissimilar. Male black and white, with carmine-red or orange-brown; Female otherwise, but with lining of wings yellow. Brilliant songsters; nest in trees and bushes; eggs spotted." Elliot Coues, 1884

Song Grosbeak Bill

"Zamelodia. Song Grosbeak. Bill extremely heavy, with the lower mandible as deep as the upper or deeper,…

"Fig 63 - Skull of a duck (Clangula islandica), nat. size; Dr. R.W. Shufeldt, U.S.A. a, premaxillary bone; b, partly ossified internasal septum; b', pervious part of nostril; c, end of premaxillary, perforated form numerous branches of second division of the fifth cranial nerve; d, dentary bone of under mandible; e, groove of nerves, etc.; f, a vacuity between dentary and other pieces of the mandible; g, articular surface; h, recurved "angle of the jaw;" i, occipital protuberance; j, vacuity in supraoccipital bone; k, muscular impression on back of skull; l is over the black ear-cavity; m, post-frontal process; n, quadrate bone; o, pterygoid; p, palatine; q, quadrato-jugal; r, jugal; s, maxillary; t, fronto-parietal dome of the brain-cavity; u; u, the lacrymal bone, immense in a duck, nearly completing rim of the orbit by approaching m; v, vomer; w, supra-orbital depression for the nasal gland; x, cranio-facial hinge; y, optic foramen; z, etc. interorbital vacuities." Elliot Coues, 1884

Duck Skull

"Fig 63 - Skull of a duck (Clangula islandica), nat. size; Dr. R.W. Shufeldt, U.S.A. a, premaxillary…

"An expression of great massiveness is the main characteristics of this Florentine style, which was principally applied in the architecture of the palaces. The forms which were borrowed from the Roman columnar construction do not in this style, as they do more or less in the other styles of the Renaissance, constitute a pseudo-architecture. The massiveness, however, of the Florentine palaces conveys rather the notion of a fortress than of a mansion of a wealthy nobleman, and this impression is increased by the smallness of the windows in comparison with the rest of the building. This is especially the case with those façades which are entirely constructed of considerably projecting ashlar of irregular size, and to a less degree in the case of those the lowest storey of which alone displays these large undressed blocks." The palace was designed by Michelozzo di Bartolomeo for Cosimo de' Medici, of the Medici family, and was built between 1445 and 1460. It was well known for its stone masonry that includes rustication and ashlar. The tripartite elevation was used here as a revelation of the Renaissance spirit of rationality, order, and classicism of human scale. This tripartite division is emphasized horizontal stringcourses that divide the building into stories of decreasing height. This makes the building seem lighter as the eye moves up to the extremely heavy cornice that caps and clearly defines the building's outline. Michelozzo di Bartolomeo was influenced in his building of this palace by both Roman principles and Brunelleschian principles. During the Renaissance revival of classical culture, Roman elements were often replicated in architecture, both built and imagined in paintings. In the Palazzo Medici Riccardi, the rusticated masonry and the cornice had precedents in Roman art.

Riccardi Palace at Florence

"An expression of great massiveness is the main characteristics of this Florentine style, which was…

"The purity of style, however, of the Genoese palaces is not so great as in the Roman, particularly as regards the heavy, ungraceful forms of details. This is shown by [this image], and there are other instances in which the faults are more marked than in the palaces in question. The palaces of Genoa may, however, be favorably contrasted with the Roman as regards height; for ground-floor and the mezzanine are raised considerably, in order to gain more light and a better view from the main storey. Owing, however, to the extreme narrowness of the streets and the consequent difficulty in obtaining a satisfactory point of view, the object is not obtained to the desired degree."

Half the Façade of a Palace at Genoa

"The purity of style, however, of the Genoese palaces is not so great as in the Roman, particularly…

"The purity of style, however, of the Genoese palaces is not so great as in the Roman, particularly as regards the heavy, ungraceful forms of details. This is shown by [this image], and there are other instances in which the faults are more marked than in the palaces in question. The palaces of Genoa may, however, be favorably contrasted with the Roman as regards height; for ground-floor and the mezzanine are raised considerably, in order to gain more light and a better view from the main storey. Owing, however, to the extreme narrowness of the streets and the consequent difficulty in obtaining a satisfactory point of view, the object is not obtained to the desired degree."

Façade of the Tursi-Doria Palace at Genoa

"The purity of style, however, of the Genoese palaces is not so great as in the Roman, particularly…

"Parra. Jacanas. Bill plover-like, contracted in continuity, enlarged terminally; with culmen depressed to end of nasal groove, then convex and decurved; outline of mandibular rami about straight to the gonys, which is ascending; commissure about straight to the decurved end. Nasal grooves along the contracted portion of the bill; nostrils small, elliptical, situate in advance of the base of the bill. Angle of mouth with a leaf-like lobe of skin (rudimentary in our species). Forehead with a large leaf-like lobe of skin, with free lateral and posterior edges, adherent centrally and anteriorly where reaching base of upper mandible. A sharp horny spur on bend o wing Primaries 10, not peculiar in structure; outer 3 about equal and longest, overlaid by the inner quills in the closed wing. Tail very short, with soft rectrices concealed be the coverts. Tibia bare below, and with the tarsus scutellate before and behind, the scutella tending to become confluent in a continuous sheath. All the toes, claws included, longer than tarsus; middle toe alone nearly as long as tarsus; outer toe alone about as long as middle, its claw shorter than that of middle toe; inner toe a little shorter than outer, its claw longer; hind toe only about as long as basal joint of middle toe, but its claw much longer than itself; all the claws slender, about straight, very acute." Elliot Coues, 1884

Parra Jacana

"Parra. Jacanas. Bill plover-like, contracted in continuity, enlarged terminally; with culmen depressed…

"Cygnus columbianus. Common American Swan. Whistling Swan. Bill with a yellow spot or blotch in front of eye, usually small, sometimes wanting. Bill less lengthened and expanded terminally than in C. buccinator, the nostrils across the middle; the distance from the anterior angle of the eye to the hind edge of the nostril more than thence to the end of the bill. Tail-feathers normally 20." Elliot Coues, 1884

Whistling Swan

"Cygnus columbianus. Common American Swan. Whistling Swan. Bill with a yellow spot or blotch in front…

"Querquedula (N.) carolinensis. American Green-winged Teal. Bill black; feet bluish-gray: iris brown. A white crescent in front of wing. Head and upper neck rich chestnut, blackening on chin, with a glossy green patch behind each eye blackening on its lower border and on the nape where it meets its fellow among the lengthened feathers of the parts, bordered below by a more or less evident whitish line, which may often be traced to the angle of the mouth. Upper parts and flanks waved with narrow black bars on a whitish ground. Under parts white, becoming, becoming buff or fawn-colored on breast, nebulated with gray, on the breast with numerous sharp circular black spots; fore neck and sides of breast waved like the upper parts. Crissum black, with a buff or creamy patch on each side. Primaries and wing-coverts leaden gray; speculum velvety purplish-black on outer half, the inner half rich green; bordered in front with chestnut, fawn or whitish tips of the greater coverts, behind by white tips of secondaries, interiorly with purplish-black stripes on the outer webs of the lengthened secondaries." Elliot Coues, 1884

American Green-winged Teal

"Querquedula (N.) carolinensis. American Green-winged Teal. Bill black; feet bluish-gray: iris brown.…

"Chroicocephalus atricilla. Laughing Gull. Black-headed Gull. Bill longer than middle toe and claw, shorter than tarsus or head, moderately compressed, rather stout for this genus. Culmen and commissure both decurved and the end, the latter somewhat sinuate at the base. Gonys considerably concave in front of the angle, somewhat so between the angle and tip; although the angle id well defined, the tip of the bill is so decurved that a chord from tip to base does not touch it." Elliot Coues, 1884

Laughing Gull Bill

"Chroicocephalus atricilla. Laughing Gull. Black-headed Gull. Bill longer than middle toe and claw,…

"Sterna dougalli. Roseate Tern. Paradise Tern. Bill about as long as head or foot, straight, slender, compressed, very acute; gonys longer than rami, former straight, latter concave in outline, with acute but not prominent angle between them. Wings shorter than usual, 1st primary little longer than next, all rounded. Tail exceedingly long and deeply forked, with very narrow filamentous outer feathers. Tibia slightly denuded; tarsus a little shorter than middle toe and claw. Whole form trim and elegant. Bill black, the extreme point yellowish, the base for a little distance, and inside of mouth, red. Feet bright yellowish-red; claws black. Cap lustrous black, very ample, reaching to lower border of eyes; under eyelid white, as is a streak to end of feathers on bill. Neck all around and entire under parts snowy white, tinted with lovely rose-pink. Mantle delicate pale pearly, over all the upper parts from the neck, including rump and base of tail, fading however to white on tips of tertials and inner webs of secondaries. Long tail-feathers white with a faint pearly tint. Primaries grayish-black, strongly silvered when fresh; outer web of the first blackish; inner webs of all pure white for more than half their breadth, this white stripe broadest on the first, toward the base of which it occupies the whole web, and on all of them continued to and usually around the very tips; shafts of all the quills white both sides nearly to end." Elliot Coues, 1884

Roseate Tern

"Sterna dougalli. Roseate Tern. Paradise Tern. Bill about as long as head or foot, straight, slender,…

"Simorhynchus cristatellus. Crested Auk. Snub-nosed Auk. Bill fundamentally small and simple, compressed-conic, with convex culmen and little sinuate horizontal commissure; but in the breeding season developing several corneous appendages, which alter its shape greatly, make it singularly irregular, and modify even the outline of the feathers at its base. These accessory pieces are: a nasal plate, filling the nasal fossa, separate from its fellow of the opposite side; a subnasal strip prolonged on the cutting edge of the upper mandibles backwards from the nostrils; a rosette-like plate at base of upper mandible just over angle of the mouth; a large shoe encasing the posterior part of the under mandible; the latter single, the other three pieces in pairs, making seven in all which are moulted; all these elements vermilion or coral-red; end of the bill enamel-yellow. (Before acquiring these growths the young bird is tetraculus of authors; the adult in winter, after shedding the, is dubius.)" Elliot Coues, 1884

Crested Auk in Summer

"Simorhynchus cristatellus. Crested Auk. Snub-nosed Auk. Bill fundamentally small and simple, compressed-conic,…

"Bill averaging somewhat longer, about 1.90; culmen, commissure, and gonys nearly straight; upper mandible somewhat dilated toward the base along the cutting edges, and less feathered; gonydeal angle prominent. Bill consequently approaches that of the next species, in width and depth, but exaggerates the length and straightness of that of the last species." Elliot Coues, 1884

Californian Guillemot Bill

"Bill averaging somewhat longer, about 1.90; culmen, commissure, and gonys nearly straight; upper mandible…

"Lomvia arra. Thick-billed Guillemot. Arrie. Bill short, stout, wide, deep; culmen curved throughout; commissure decurved at end; gonys if anything concave in outline, the angle very protuberant; cutting edges of the upper mandible dilated and denuded toward the base, this bare turgid space flesh-colored in life, drying pale yellowish." Elliot Coues, 1884

Thick-billed Guillemot Bill

"Lomvia arra. Thick-billed Guillemot. Arrie. Bill short, stout, wide, deep; culmen curved throughout;…

"Zenaidura carolinensis. Carolina Dove. Mourning Dove. Wild Dove. Upper parts, including middle tail-feathers, grayish-blue shaded with brownish-olive, the head and neck ochrey-brown overlaid with glaucous-blue, the sides of the neck glittering with golden and ruby iridescence; a violet-black spot under the ear-coverts. Under parts glaucous-purplish, changing gradually to ochraceous on the belly and crissum, to bluish on the sides and under the wings, to whitish on the chin; the purplish tint spreading up on the sides and front of the head to blend with the glaucous-blue. Black spots on some of the scapulars and wing-coverts, most of which are colored to correspond with the back, the larger ones being rather bluish-plumbeous. Lateral tail-feathers plumbeous-bluish, crossed with a black bar, the outer four on each side broadly ended with white. Bill black; angle of mouth carmine; iris brown; bare skin around eye livid bluish; feet lake-red, drying dull yellowish." Elliot Coues, 1884

Carolina Dove

"Zenaidura carolinensis. Carolina Dove. Mourning Dove. Wild Dove. Upper parts, including middle tail-feathers,…

This is an advance turn arrow pointed to the left. The shaft is bent at a 90-degree angle.

Left Advance Turn Arrow Auxiliary, Black and White

This is an advance turn arrow pointed to the left. The shaft is bent at a 90-degree angle.

This is an advance turn arrow pointed to the left. The shaft is bent at a 90-degree angle.

Left Advance Turn Arrow Auxiliary, Outline

This is an advance turn arrow pointed to the left. The shaft is bent at a 90-degree angle.

This is an advance turn arrow pointed to the left. The shaft is bent at a 90-degree angle.

Left Advance Turn Arrow Auxiliary, Silhouette

This is an advance turn arrow pointed to the left. The shaft is bent at a 90-degree angle.

This is an advance turn arrow pointed to the left. The shaft is bent at a 45-degree angle.

Left Advance Turn Arrow Auxiliary, Black and White

This is an advance turn arrow pointed to the left. The shaft is bent at a 45-degree angle.