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Leaves - compound (odd-feathered, leaflets, seven to nine); alternate; edge slightly and rather roundly toothed. Outline - of leaflets, mostly long oval, the lower pairs becoming smaller and more egg-shaped. Apex - long-pointed. Base - of the end leaflet, wedge-shape; of the others, more or less blunted. Leaf/Stem - rough throughout. Buds - large and round and covered with downy, yellowish-brown scales, or, in winter, with hard and grayish-white scales. Leaflet/Stem - lacking (or scarcely noticeable), except the short, roughish stem of the end leaflet. Leaflets - two to seven inches long, rough beneath, especially on the ribs; fragrant when crushed. Bark - rough, becoming cracked across, but not scaly. Fruit - rounded, slightly egg-shaped or oval, one and one half to two inches or more in length. The husk is about one fourth of an inch thick and splits nearly to the base when ripe. Nut - slightly six-angled, light brown, with a very thick and hard shell. Kernel - is sweet, but small. October. Found - common in dry woods, especially southward and westward. It grows in Southern Canada and I all the Atlantic States. General Information - All the Hickories are picturesque trees. Their tendency, even when standing alone, is to grow high, and with heads that, instead of being round, are cylinder-shaped to the very top, with only enough breaks and irregularities to add to the effect. This tendency is more marked in the Hickories than in any other of the leaf-shedding trees of North America. They are worthy of the name sometimes given them of 'the artist's tree." Hicoria, from a Greek word meaning round, in allusion to the shape of the nut.

Genus Hicoria, Raf., Carya, Nutt. (Hickory)

Leaves - compound (odd-feathered, leaflets, seven to nine); alternate; edge slightly and rather roundly…

Leaves - compound (odd-feathered; leaflets, five to seven, oftenest five); alternate; edge of leaflets sharp-toothed. Outline - of leaflets, mostly long oval. Apex - pointed. Base - pointed. Leaf/Stem - smooth. Leaflet/Stems - lacking (or scarcely noticeable), excepting the short stem of the end leaflet. Leaflets - mostly four to eight inches long, remarkable smooth, excepting that the under surface is tufted in the angles of the ribs and usually dotted with dark glandular spots. Bark - rough and close. Fruit - broad egg-shape. Husk - thin, splitting part way to the base. Nut - small (three fourths of an inch in diameter), not angled, not sharp-pointed, and with a thin shell. Found - on moist ground, New York to Delaware, west to Michigan and Illinois, rarely, if ever, in New England. General Information - All the Hickories are picturesque trees. Their tendency, even when standing alone, is to grow high, and with heads that, instead of being round, are cylinder-shaped to the very top, with only enough breaks and irregularities to add to the effect. This tendency is more marked in the Hickories than in any other of the leaf-shedding trees of North America. They are worthy of the name sometimes given them of 'the artist's tree." Hicoria, from a Greek word meaning round, in allusion to the shape of the nut.

Genus Hicoria, Raf., Carya, Nutt. (Hickory)

Leaves - compound (odd-feathered; leaflets, five to seven, oftenest five); alternate; edge of leaflets…

Leaves - compound (odd-feathered; leaflet, five to nine, usually seven) ; alternate, edge of leaflets sharp-toothed. Outline - of leaflets, usually long oval. Apex - taper-pointed. Base - of end leaflet, wedge-shaped, of the others more or less rounded or slightly pointed. Leaf/Stem - smooth. Leaf/Buds - egg-shape and pointed or rounded, and with their outer scales a polished-brown. Leaflet/Stems - lacking, except the smooth, very short stem of the end leaflet. Leaflets - mostly two to five inches long (the lower ones much the smallest), smooth above and below. Bark - not shaggy. Fruit - of two forms: (a) pear-shape, (b) rounded. Husks - very thin, splitting about half-way to the base. Nut - about one inch in diameter; in (b) somewhat flattened at the sides and slightly hollowed above, and with the apex a sharp point. Shell - rather thin, smooth, hard, and bluish-gray. Meat - small and sweetish or slightly bitter. Found - from Southern Maine westward and southward. General information - All the Hickories are picturesque trees. Their tendency, even when standing alone, is to grow high, and with heads that, instead of being round, are cylinder-shaped to the very top, with only enough breaks and irregularities to add to the effect. This tendency is more marked in the Hickories than in any other of the leaf-shedding trees of North America. They are worthy of the name sometimes given them of 'the artist's tree." Hicoria, from a Greek word meaning round, in allusion to the shape of the nut.

Genus Hicoria, Raf., Carya, Nutt. (Hickory)

Leaves - compound (odd-feathered; leaflet, five to nine, usually seven) ; alternate, edge of leaflets…

Leaves - compound (odd-feathered; leaflets, seven to eleven); alternate; edge of leaflet sharp-toothed. Outline - of leaflet, long oval or long egg-shape. Apex, taper-pointed. Base, pointed or blunted. Leaf/Stem - rather slender, somewhat downy, and often flattened and winged. Leaf/buds - small, slightly rounded or (at the ends of the branchlets) pointed, and yellow. Leaflet/Stems - lacking, except the short stem of the end leaflet. Leaflets - four to six inches long, the upper one usually short; smooth on both sides, or with a slight, scattered down below. Bark - rather smooth. Fruit - rounded or slightly egg-shaped, dark green. Husk - very thin and fleshy, never becoming entirely hard, with prominent winged edges at the seams, only two of which reach more than half-way to the base. It divides half-way down when ripe. Nut - barely one inch long, heart-shaped at the top, broader than long, white and smooth. Shell - so thin that it can be broken with the fingers. Kernel - intensely bitter. Found - usually in wet grounds, though often also on rich uplands, from Southern Maine westward and southward. It reaches its finest growth in Pennsylvania and Ohio. General information - A rather smaller and less valuable tree than the rest of the hickories.

Genus Hicoria, Raf., Carya, Nutt. (Hickory)

Leaves - compound (odd-feathered; leaflets, seven to eleven); alternate; edge of leaflet sharp-toothed.…

Leaves - compound (odd-feathered; leaflets, three, sometimes five, rarely seven); opposite; edge of leaflet remotely and unequally coarse-toothed. Outline - of leaflets, egg-shape or oval. Apex - taper-pointed. Base - variable and often uneven. Leaflets - slightly rough; the ribs very marked. Bark - of young trunks, smoothish and yellowish-green; twigs, light green. Flowers - small and greenish, in delicate, drooping clusters from the sides of the branches. Fruit - large, yellowish-green, smooth, in long, loose, late-hanging clusters. Found - North, South, and West. One of the most widely distributed of the North American trees, with its finest growth in the region of the Wabash and Cumberland rivers. General Information - A tree twenty to thirty feet high, with spreading branches. Its wood is light and of slight value.

Genus Negundo, Moench

Leaves - compound (odd-feathered; leaflets, three, sometimes five, rarely seven); opposite; edge of…

Leaves - compound (odd-feathered; leaflets, seven to nine); opposite; edge of leaflets slightly toothed or entire; entire at base. Outline - of leaflet, long oval or long egg-shape. Apex - taper-pointed. Base - somewhat pointed. Leaf/Stem - smooth. Leaflet/Stem - about one fourth of an inch long, or more; smooth. Leaf/Bud - rusty-colored and smooth. Leaflet - two to six inches long; pale beneath; downy when young, but becoming nearly smooth, except on the ribs. Bark - of the trunk, light gray. In very young trees it is nearly smooth, but it soon becomes deeply furrowed - the furrows crossing each other, and so breaking the bark into irregular, somewhat square or lozenge-shaped plates. Then in very old trees it becomes smooth again, from the scaling off of the plates. The branches are smooth and grayish-green. The young shoots have a polished, deep-green bark, marked with white lines or dots. Winged seeds - one and a half to two inches long, with the "wing" about one fourth of an inch wide, hanging in loose clusters from slender stems. The base of the seed it pointed and not winged. Found - in rich woods, from Southern Canada to Northern Florida and westward. It is most common in the Northern States. The finest specimens are seen in the bottom lands of the lower Ohio River basin. General Information - a tree forty to eighty feet high. Often the trunk rises forty feet without branching. Its tough and elastic timer is of very great value, being widely used in the manufacture of agricultural implements, for oars, and the shafts of carriages, and in cabinet-work. Fraxinus from a Greek word meaning "separation," because of the ease with which the wood of the Ash can be split. I find in the notes of an old copy of White's "Natural History of Selborne" this comment: "The Ash, I think, has been termed by Gilpin the Venus of British trees." Gerardes' "Herbal" comments: "The leaves of the Ash are of so great a vertue against serpents, as that the serpents dare not be so bolde as to touch the morning and evening shadowes of the tree, but shunneth them afarre off, as Pliny reporteth in his 16 book, 13 chap. He also affirmeth that the serpent being penned in with boughes laide rounde about, will sooner run into the fire, if any be there, than come neere to the boughes of the Ash." In Scandinavian mythology the great and sacred tree, Yggdrasil, the greatest and most sacred of all trees, which binds together heaven and earth and hell, is an Ash. Its roots spread over the whole earth. Its branches reach above the heavens. Underneath lies a serpent; above is an eagle; a squirrel runs up and down the trunk, trying to breed strife between them.

Genus Fraxinus, L. (Ash)

Leaves - compound (odd-feathered; leaflets, seven to nine); opposite; edge of leaflets slightly toothed…

Leaves - compound (odd-feathered; leaflets, seven to nine); edge of leaflets nearly entire or slightly toothed. Outline - of leaflet, long oval or egg-shape. Apex - taper-pointed. Base - somewhat pointed. Leaf/Stem - velvety-downy. Leaflet/Stem - about one fourth of an inch long, or somewhat less, and velvety-downy. Leaf/Bud - rounded, nearly concealed by the leaf-stem, downy, and of a dark, rusty brown. Leaflet - two to six inches long, downy beneath, and pale, becoming reddish. Bark - of the trunk, dark ashy or granite-gray, or of a deep brown. It is slightly furrowed up and does, the furrows seldom joining or crossing. The branches are grayish. The young shoots are velvety, with a grayish or rusty down. Winged seeds - resembling those of the White Ash, but usually with the end of the wing more rounded. Found - along borders of streams and in low and swampy ground - New Brunswick to Minnesota, and southward to Northern Florida and Alabama; but rare west of the Alleghany Mountains. Its finest growth is in the Northern Atlantic States. General Information - A medium-sized tree, usually thirty to fifty feet high, of less value than the White Ash. Fraxinus from a Greek word meaning "separation," because of the ease with which the wood of the Ash can be split. I find in the notes of an old copy of White's "Natural History of Selborne" this comment: "The Ash, I think, has been termed by Gilpin the Venus of British trees." Gerardes' "Herbal" comments: "The leaves of the Ash are of so great a vertue against serpents, as that the serpents dare not be so bolde as to touch the morning and evening shadowes of the tree, but shunneth them afarre off, as Pliny reporteth in his 16 book, 13 chap. He also affirmeth that the serpent being penned in with boughes laide rounde about, will sooner run into the fire, if any be there, than come neere to the boughes of the Ash." In Scandinavian mythology the great and sacred tree, Yggdrasil, the greatest and most sacred of all trees, which binds together heaven and earth and hell, is an Ash. Its roots spread over the whole earth. Its branches reach above the heavens. Underneath lies a serpent; above is an eagle; a squirrel runs up and down the trunk, trying to breed strife between them.

Genus Fraxinus, L. (Ash)

Leaves - compound (odd-feathered; leaflets, seven to nine); edge of leaflets nearly entire or slightly…

Leaves - compound (odd-feathered; leaflets, seven to eleven, usually nine); opposite; edge of leaflet toothed. Outline - of leaflet, narrow, long oval or long egg-shaped Apex - taper-pointed. Base - rounded. Leaf/Stem - lacking. Leaf/Bud - deep blue or blackish. Leaflet - three to five inches long, smooth and green on both sides, excepting where it is slightly hairy along the lower part of the middle rib. When crushed it has an Elder-like odor. Bark - of trunk, dark granite-gray, somewhat furrowed and broken up and down with roughness, which continue in the old tree. The young branches are smooth and grayish and marked with black and white dots and warts. Winged seeds - nearly one and one half inches long, with the wing three eighths of an inch wide and extending around the seed. Ripe in July. Found - along low river-banks and in swamps, which it sometimes fills; in Delaware, the mountains of Virginia, Northwestern Arkansas, through the Northern States to Canada. It is the most Northern of the American Ashes. General Information - Usually a small or medium-sized tree. The wood is largely used for barrel-hoops, baskets, in cabinet-work, and interior finish. Fraxinus from a Greek word meaning "separation," because of the ease with which the wood of the Ash can be split. I find in the notes of an old copy of White's "Natural History of Selborne" this comment: "The Ash, I think, has been termed by Gilpin the Venus of British trees." Gerardes' "Herbal" comments: "The leaves of the Ash are of so great a vertue against serpents, as that the serpents dare not be so bolde as to touch the morning and evening shadowes of the tree, but shunneth them afarre off, as Pliny reporteth in his 16 book, 13 chap. He also affirmeth that the serpent being penned in with boughes laide rounde about, will sooner run into the fire, if any be there, than come neere to the boughes of the Ash." In Scandinavian mythology the great and sacred tree, Yggdrasil, the greatest and most sacred of all trees, which binds together heaven and earth and hell, is an Ash. Its roots spread over the whole earth. Its branches reach above the heavens. Underneath lies a serpent; above is an eagle; a squirrel runs up and down the trunk, trying to breed strife between them.

Genus Fraxinus, L. (Ash)

Leaves - compound (odd-feathered; leaflets, seven to eleven, usually nine); opposite; edge of leaflet…

Leaves - compound (hand-shaped; leaflets, usually five, sometimes seven); opposite; edge toothed. Outline - of leaflet, long oval, long egg-shape, or long reverse egg-shape. Apex - taper-pointed. Base - pointed. Leaflet - four to nine inches long, one to three inches wide, usually minutely downy beneath. Flowers, pale yellow. April, May. Fruit - two to two and one half inches in diameter, rounded. Husk - not prickly, but uneven. Nut - one or two in a husk, large and brown. Found - from Alleghany County, Pennsylvania, southward along the Alleghany Mountains to Northern Georgia and Alabama, and westward. General Information - A tree thirty to seventy feet high. Its wood is light and hard to split. With the other species of the same genus it is preferred, above any other American wood, for the making of artificial limbs.

Genus Aesculus, L. (Buckeye, Horse Chestnut)

Leaves - compound (hand-shaped; leaflets, usually five, sometimes seven); opposite; edge toothed. Outline…

Leaves - compound (hand-shaped; leaflets, five); opposite; edge toothed. Outline - of leaflet, oval or long oval. Apex - taper-pointed. Base - pointed. Leaflets - three to seven inches long; one and a half to three inches wide. Bark - with a disagreeable odor. Flowers - small, yellowish-white. June. Fruit - about three fourths of an inch in diameter. Husk - prickly when young. Nut - smooth. Found - along the western slopes of the Alleghany Mountains - Pennsylvania to Northern Alabama and westward. General Information - A small, ill-scented tree (eighteen to thirty-five feet high). Its wood is light and hard to split. With the other species of the same genus it is preferred, above any other American wood, for the making of artificial limbs.

Genus Aesculus, L. (Buckeye, Horse Chestnut)

Leaves - compound (hand-shaped; leaflets, five); opposite; edge toothed. Outline - of leaflet, oval…

The parts of a volcano illustrated with Mount Vesuvius: "a, the cone; b, summit cinder-cone; c, Somma, part of former outline of crater; d, Hermitage (now Observatory); e, Portici; f, Herculaneum; g, Torre del Greco." -Dana, 1883

Mount Vesuvius

The parts of a volcano illustrated with Mount Vesuvius: "a, the cone; b, summit cinder-cone; c, Somma,…

"Bruchus 4-maculatus: a, cowpea, showing holes made by weevils in their escape from seed, also eggs deposited on surface; b, egg in outline; c, post-embryonic larva; d, head of same; e, prothoracic leg; f, spine." -Department of Agriculture, 1899

Four-Spotted Bean Weevil

"Bruchus 4-maculatus: a, cowpea, showing holes made by weevils in their escape from seed, also eggs…

"Camera-lucida outline of portion of cross section of cornstalk, showing at g bast fiber zone beneath the epidermis and surrounding the outermost vascular bundles." -Stevens, 1916

Cornstalk Bast Fibers

"Camera-lucida outline of portion of cross section of cornstalk, showing at g bast fiber zone beneath…

"Outline of tangential section of wood of oak, to show frequency of medullary rays. The section is 1 mm. square. The number of rays shown is below the average for woodyplants." -Stevens, 1916

Oak Wood

"Outline of tangential section of wood of oak, to show frequency of medullary rays. The section is 1…

"Diagrammatic longitudinal section of a Nemertean (Amphiporum lactifloreus), dorsal view. p.p., Proboscis pore; b., brain giving off the lateral nerve-cords (n.); po., oesophageal pocket; p., proboscis lying within its sheath; st., stilet of proboscis; m., retractor muscles of proboscis; g., gut shown in outline at the sides of proboscis; e., the three main, longitudinal blood vessels, which unite both anteriorly and posteriorly." -Thomson, 1916

Nemertea

"Diagrammatic longitudinal section of a Nemertean (Amphiporum lactifloreus), dorsal view. p.p., Proboscis…

"Outline of Acanthodes sulcatus. p., Pectoral fins; v., pelvis; a., anal; d., dorsal." -Thomson, 1916

Acanthodes Sulcatus

"Outline of Acanthodes sulcatus. p., Pectoral fins; v., pelvis; a., anal; d., dorsal." -Thomson, 1916

"Diagram of the heart and the branchial arches in Mammals. A dotted outline of the arches of the Fish is drawn for ready comparison. The auricles are represented in a posterior position...a, aorta; au., auricle; c, carotid; d.a., dorsal arteries; j, jugular veins; s.v., sinus venosus; v, ventricle." -Galloway, 1915

Mammal Heart

"Diagram of the heart and the branchial arches in Mammals. A dotted outline of the arches of the Fish…

"Diagram of head and brain of human foetus six weeks old (heavy boundaries). The dotted line indicates the outline of the brain of a foetus three months old. Note thee great growth of the hemisphere (h). cer, cerebellum; med, medulla oblongata; mes, mesencephalon; p, pituitary body; pr, prosencephalon; s.c., spinal cord; th, thalamencephalon; 1, olfactory nerve; 2, optic nerve." -Galloway, 1915

Human Fetus

"Diagram of head and brain of human foetus six weeks old (heavy boundaries). The dotted line indicates…

"The outline of the brain of an orang outang. Front portion F to O, cerebrum; C, cerebellum; M, medulla and spinal cord; F, the frontal lobe; P, the parietal lobe; O, the occipital lobe; T, the temporal lobe; R, the fissure of Rolando; S, the fissure of Silvius." -Galloway, 1915

Orangoutang Brain

"The outline of the brain of an orang outang. Front portion F to O, cerebrum; C, cerebellum; M, medulla…

"Ophioglypha lacertosa. A, outline, of the natural size; B, central disc, dorsal view; C, the disc, ventral view showing the mouth and genital fissures." -Parker, 1900

O. Lacertosa

"Ophioglypha lacertosa. A, outline, of the natural size; B, central disc, dorsal view; C, the disc,…

"General outline of leaves. a, linear; b, lanceolate; c, wedge-shaped; d, spatulate; e, ovate; f, obovate; g, kidney-shaped; h, orbicular; i, elliptical." -Bergen, 1896

Leaf Shapes

"General outline of leaves. a, linear; b, lanceolate; c, wedge-shaped; d, spatulate; e, ovate; f, obovate;…

The bronchia. Labels; 1, Outline of the right lung. 2, Outline of the left lung. 3, Larynx. 4, Trachea. 5, 6, 7, 8, Bronchial tubes. 9, Air-cells.

The Bronchia

The bronchia. Labels; 1, Outline of the right lung. 2, Outline of the left lung. 3, Larynx. 4, Trachea.…

Primitive nerve fibers. A, A perfectly fresh tubule with a single dark outline. B. A tubule or fiber with a double contour from commencing post-mortem change. C. The changed further advanced, producing a varicose or beaded appearance. D. A tubule or fiber, the central part of which , in consequence of still further changes, has accumulated into separate portions within the sheath.

Primitive Nerve Fibers

Primitive nerve fibers. A, A perfectly fresh tubule with a single dark outline. B. A tubule or fiber…

Acetic acid (dilute) causes the nucleus of the red blood cells in the frog to become more clearly defined; if the action is prolonged, the nucleus becomes strongly granulated, and all the coloring matter seems to be concentrated in it, the surrounding cell substance and outline of the cell becoming almost invisible; after a time the cells lose their color altogether. The cells shown represent the successive stages of change. A similar loss of color occurs in the red cells of human blood, which , however, from the absence of nuclei, seem to disappear entirely.

Effect of Acetic Acid on Red Blood Cells

Acetic acid (dilute) causes the nucleus of the red blood cells in the frog to become more clearly defined;…

Human colorless blood corpuscle, showing its successive changes of outline within ten minutes when kept moist on a warm stage.

The Change of Colorless Blood Corpuscles

Human colorless blood corpuscle, showing its successive changes of outline within ten minutes when kept…

Outline showing the general form of the larynx, trachea, and bronchi, as seen from front. Labels: h, the great cornu of the hyoid bone; e,epiglottis; t, superior and inferior cornu of the thyroid cartilage; c, middle of the cricoid cartilage; tr, the trachea, showing sixteen cartilaginous rings; b, the right bronchus; b1, the left bronchus.

Front View of Respiratory Apparatus

Outline showing the general form of the larynx, trachea, and bronchi, as seen from front. Labels: h,…

Outline showing the general form of the larynx, trachea, and bronchi, as seen from behind. Labels: h, the great cornu of the hyoid bone; e,epiglottis; t, superior cornu of the thyroid cartilage ; t1, inferior cornu of the thyroid cartilage; a, points to the back of both the arytenoid cartilages, which are surmounted by the cornicula; c, the middle ridge on the back of the cricoid cartilage; tr, the posterior membranous part of the trachea; b, b1, right and left bronchi.

Back View of Respiratory Apparatus

Outline showing the general form of the larynx, trachea, and bronchi, as seen from behind. Labels: h,…

Plan in outline of the encephalon, as seen from the right side. The parts are represented as separated from one another somewhat more than natural, so as to show their connections. A, cerebrum; f, g, h, its anterior middle, and posterior lobes; e, fissure of Sylvius; B, cerebellum; C, pons Varolii; D, medulla oblongata; a, peduncles of the cerebellum; C, pons Varolii; D, medulla oblongata; A, peduncles of the cerebrum; b, c, d, superior, middle, and inferior peduncles of the cerebellum.

Outline of the Encephalon

Plan in outline of the encephalon, as seen from the right side. The parts are represented as separated…

Outline sketch of a section of the cerebellum, showing the corpus dentatum. The section has been carried through the left lateral part of the pons, so as to divide the superior peduncle and pass nearly through the middle of the left cerebellar hemisphere. The olivary body has also been divided longitudinally so as to expose in section its corpus dentatum. c r, crus cerebri; f, fillet; q, corpora quadrigemina; s p, superior peduncle of the cerebellum divided; m p, middle peduncle or lateral part of the pons Varolii, with fibers passing from it into the white stem; a v, continuation of the white stem radiating towards the arbor vitae of the folia; c d, corpus dentatum; o, olivary body with its corpus dentatum; p, anterior pyramid.

The Cerebellum of the Brain

Outline sketch of a section of the cerebellum, showing the corpus dentatum. The section has been carried…

Embryo chick (36 hours), viewed from beneath as a transparent object (magnified). Labels:pl, outline of pellucid area; FB, forebrain, or first cerebral vesicle: from its sides project op, the optic vesicles; SO, backward limit of somatopleure fold, "tucked in", under head; A, head-fold of true amnion; a', reflected layer of amnion, sometimes termed "false amnion;" sp, backward limit of splanchnopleure folds, along which run the omphalomesaraic veins uniting to form h, the heart, which is continued forwards into ba, the bulbus arteriosus; d, the foregut, lying behind the heart, and having a wide crescentic opening between the splanchnopleure folds; HB, hindbrain; MB, midbrain; pv, protovertebrae lying behind the foregut; mc, line of junction of medullary folds and of notochord; ch, front end of notochord; vpl, vertebral plated; pr, the primitive groove at its caudal end.

Embryo Chick

Embryo chick (36 hours), viewed from beneath as a transparent object (magnified). Labels:pl, outline…

Diagram illustrating the development of veins about the liver. B, dc, ducts of Cuvier, right and left; ca, right and left cardinal veins; o, left omphalo-mesenteric vein, almost shriveled up; u, u', umbilical veins, of which u', the right one has almost disappeared. Between the venae cardinales is seen the outline of the rudimentary liver with its venae hepaticae advehentes, and revehentes. D, ductus venosus; i', hepatic veins; P', venae advehentes; m, mesenteric veins.

Development of Veins in the Liver

Diagram illustrating the development of veins about the liver. B, dc, ducts of Cuvier, right and left;…

Radiographic outline of the stomach of a patient who has taken a bismuth-laden diet.

Stomach in a Bismuth-Laden Diet

Radiographic outline of the stomach of a patient who has taken a bismuth-laden diet.

Throughout the dorsal region, the spinal cord presents a uniform girth and a very nearly circular outline when seen in transverse section. Shown is the roots and origin of the seventh dorsal nerve.

Seventh Dorsal Nerve

Throughout the dorsal region, the spinal cord presents a uniform girth and a very nearly circular outline…

A sketch of the country side.

Landscape Sketch

A sketch of the country side.

In cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. A contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness of slopes. The contour interval of a contour map is the difference in elevation between successive contour lines.

Glacier Contours

In cartography, a contour line (often just called a "contour") joins points of equal elevation (height)…

In cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. A contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness of slopes. The contour interval of a contour map is the difference in elevation between successive contour lines.

Glacier Form Lines

In cartography, a contour line (often just called a "contour") joins points of equal elevation (height)…

In cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. A contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness of slopes. The contour interval of a contour map is the difference in elevation between successive contour lines.

Contour System

In cartography, a contour line (often just called a "contour") joins points of equal elevation (height)…

The typical representation of depression contours, if otherwise ambiguous, on a topographical map.

Depression Contours

The typical representation of depression contours, if otherwise ambiguous, on a topographical map.

The typical representation of rocky bluffs on a topographical map.

Rocky Bluffs

The typical representation of rocky bluffs on a topographical map.

The typical representation of bluffs (other than rocky) on a topographical map.

Bluffs, Other than Rocky

The typical representation of bluffs (other than rocky) on a topographical map.

The typical representation of sand dunes on a topographical map.

Sand Dunes

The typical representation of sand dunes on a topographical map.

The typical representation of a marsh in general (or fresh marsh) on a topographical map.

Fresh Marsh

The typical representation of a marsh in general (or fresh marsh) on a topographical map.

The typical representation of a salt marsh on a topographical map.

Salt Marsh

The typical representation of a salt marsh on a topographical map.

The typical representation of a wooded marsh on a topographical map.

Wooded Marsh

The typical representation of a wooded marsh on a topographical map.

The typical representation of a cypress swamp marsh on a topographical map.

Cypress Swamp Marsh

The typical representation of a cypress swamp marsh on a topographical map.

The typical representation of any kind of woods or broad leaved trees on a topographical map.

Woods of any Kind (or Broad Leaved Trees)

The typical representation of any kind of woods or broad leaved trees on a topographical map.

The typical representation of pine trees or any other narrow leaved trees on a topographical map.

Pine (or Narrow Leaved Trees)

The typical representation of pine trees or any other narrow leaved trees on a topographical map.

The typical representation of palm trees on a topographical map.

Palm Trees

The typical representation of palm trees on a topographical map.

The typical representation of palmettos on a topographical map.

Palmetto

The typical representation of palmettos on a topographical map.

The typical representation of mangrove on a topographical map.

Mangrove

The typical representation of mangrove on a topographical map.

The typical representation of bamboo on a topographical map.

Bamboo

The typical representation of bamboo on a topographical map.

The typical representation of cactus on a topographical map.

Cactus

The typical representation of cactus on a topographical map.

The typical representation of banana on a topographical map.

Banana

The typical representation of banana on a topographical map.

The typical representation of orchard on a topographical map.

Orchard

The typical representation of orchard on a topographical map.

The typical representation of grasslands on a topographical map.

Grassland in General

The typical representation of grasslands on a topographical map.

The typical representation of tall tropical grasses on a topographical map.

Tall Tropical Grass

The typical representation of tall tropical grasses on a topographical map.

The typical representation of cultivated fields in general on a topographical map.

Cultivated Fields in General

The typical representation of cultivated fields in general on a topographical map.

The typical representation of cotton on a topographical map.

Cotton

The typical representation of cotton on a topographical map.

The typical representation of rice on a topographical map.

Rice

The typical representation of rice on a topographical map.

The typical representation of sugar cane on a topographical map.

Sugar Cane

The typical representation of sugar cane on a topographical map.