ClipArt ETC
One Free Hexomino

Free Hexomino

One Free Hexomino

One Free Hexomino

Free Hexomino

One Free Hexomino

One Free Hexomino

Free Hexomino

One Free Hexomino

A poster of thirty five Free Hexominoes.

Free Hexominoes Poster.

A poster of thirty five Free Hexominoes.

A poster of twelve Free Pentominoes.

Free Pentominoes Poster.

A poster of twelve Free Pentominoes.

A poster of five Free Tetrominoes

Free Tetrominoes Poster.

A poster of five Free Tetrominoes

Teeth of a frugivore (fruit-eating animal). Animals that live on soft fruits do not need such grinders as grass-eating animals do, instead they have rounded teeth which serve to crush their food.

Teeth of a Frugivore

Teeth of a frugivore (fruit-eating animal). Animals that live on soft fruits do not need such grinders…

A thin slice through the skin. Labels: a, dead part; d, live part of the epidermis; ar, artery; e, sweat glands; n, nerves.

Section of the Skin

A thin slice through the skin. Labels: a, dead part; d, live part of the epidermis; ar, artery; e, sweat…

A lobule of a pig liver, magnified, showing the hepatic cells radially arranged around the central intralobular vein, and the connective tissue surrounding the lobule.

Liver Lobule of a Pig

A lobule of a pig liver, magnified, showing the hepatic cells radially arranged around the central intralobular…

Leaves - simple; alternate; lobed (the edge of the lobes entire, or of the larger ones sometimes wavy). Outline - reverse egg-shape. Apex - of the lobes, rounded. Base - wedge-shape. Leaf - six to fifteen inches long (the longest of the oak-leaves); smooth above, downy beneath; the lobes usually long and rather irregular, the middle ones longest and often extending nearly to the middle rib. Bark - of the young branches always marked with corky wings or ridges. Acorns - large, with short stems. Cup - two thirds to two inches across, roughly covered with pointed scales, and heavily fringed around the nut. Nut - very large (one to one and a half inches long); broad egg-shape; one half to two thirds or often wholly enclosed by the cup. Found - along the coast of Maine southward as far as the Penobscot, in Western New England, in Western New York, in Pennsylvania, and thence westward to the foot-hills of the Rocky Mountains of Montana, and from Central Nebraska and Kansas southwest to the Indian Territory and Texas. It is found farther west and northwest than any other oak of the Atlantic forests. In the prairie region it forms a principal growth of the "Oak Openings." General Information - One of the most valuable and widely distributed oaks in North America, growing sixty to eighty feet in height, or more, with hard, tough wood resembling that of the White Oak. "The most interesting thing about this tree, perhaps is its power, quite unknown in the other White Oaks, of adapting itself to very different climatic conditions, which enables it to live in the humid climate of Maine and Vermont, to flourish in the somewhat drier climate of the Mississippi Valley, and to exist (still farther west) in the driest and most exposed region in habited by any of the Eastern America Oaks." - Sargent. Q. m. olivaformis is a variety found only in a few districts (near Albany and in Pennsylvania), having narrower and rather more deeply lobed leaves. Quercus, possible from a Celtic word meaning to inquire, because it was among the oaks that the Druids oftenest practised their rites.

Genus Quercus, L. (Oak)

Leaves - simple; alternate; lobed (the edge of the lobes entire, or of the larger ones sometimes wavy).…

Leaves - simple; alternate; edge entire. Outline - long and narrow. Apex - pointed and bristle-tipped. Base - pointed. Leaf - three to six inches long; one to two inches wide; smooth and shining above; somewhat downy beneath; thick and stiff. Bark - smooth and unbroken. Acorns - small, nearly stemless. Cup - shallow. Nuts - rounded; about one half inch in diameter; bitter. October. Found - in Lehigh County, Pennsylvania (Porter), westward to Southeastern Iowa, and southward. Most common west of the Alleghany Mountains. General Information - A tree thirty to fifty feet high, with poor wood, that is used at the West for shingles and clapboards. Note: Of the nine hybrids that have been recognized, most are outside of our limits or entirely local. Mention need be made only of tow: Q. heterophylla, Michaux ("Bartram's Oak"). Staten Island and New Jersey to Delaware and North Carolina; Q. Rudkini, Britt., New Jersey. Quercus, possible from a Celtic word meaning to inquire, because it was among the oaks that the Druids oftenest practised their rites. The Oak "Live thy Life, Young and old, Like yon oak, Bright in spring, Living gold; Summer-rich, Then; and then Autumn-changed, Sober-hued Gold again. All his leaves fall'n at length, Look, he stands, Trunk and bough, Naked strength.: Alfred (Lord) Tennyson, 1889.

Genus Quercus, L. (Oak)

Leaves - simple; alternate; edge entire. Outline - long and narrow. Apex - pointed and bristle-tipped.…

The larynx viewed from its pharyngeal opening. The back wall of the pharynx has been divided and its edges (11) turned aside. Labels 1, body of hyoid; 2, its small, and 3, its great, horns; 4, upper and lower horns of thyroid cartilages; 5, mucous membrane of front of pharynx, covering the back of the cricoid cartilage; 6, upper end of gullet; 7, windpipe, lying in front of the gullet; 8, eminence caused by cartilage of Santorini; 9, eminence caused by cartilage of Wrisberg; both lie in, 10, the artytenoepiglottic fold of mucous membrane, surrounding the opening (aditus laryngis) from pharynx to larynx; a, projecting tip of epiglottis; c, the glottis, the lines leading from the latter point to the free vibratory edges of the vocal cords; b', the ventricles of the larynx; their upper edges, marking them off from the eminences b, are the false vocal cords.

Larynx

The larynx viewed from its pharyngeal opening. The back wall of the pharynx has been divided and its…

The various types of oak leaves: "a. Bur oak, b. Live oak, c. Willow oak, d. White oak." -Foster, 1921

Oak Leaves

The various types of oak leaves: "a. Bur oak, b. Live oak, c. Willow oak, d. White oak." -Foster, 1921

A "long house" where up to fifty families would live, built by the Native American tribe, the Iroquois.

Iroquois Long House

A "long house" where up to fifty families would live, built by the Native American tribe, the Iroquois.

The leaf of a live-oak tree.

Live-Oak Leaf

The leaf of a live-oak tree.

Nicaragua Official Envelope (value unknown) from 1890

Nicaragua Unknown Value Official Envelope, 1890

Nicaragua Official Envelope (value unknown) from 1890

Egypt Official Stamp (value unknown) from 1864-1868

Egypt Official Stamp Unknown Value, 1864-1868

Egypt Official Stamp (value unknown) from 1864-1868

Egypt Official Stamp (value unknown) from 1868-1872

Egypt Official Stamp Unknown Value, 1868-1872

Egypt Official Stamp (value unknown) from 1868-1872

Iceland Official Stamp (2 aur.) from 1876

Iceland Official Stamp, 2 Aur, 1876

Iceland Official Stamp (2 aur.) from 1876

Würtemberg Official Stamp (10 pfennig) from 1881

Würtemberg Zehn Pfennig Official Stamp, 1881

Würtemberg Official Stamp (10 pfennig) from 1881

India Official Stamp (3 pies) from 1890-1891

India, Three Pies Official Stamp, 1890-1891

India Official Stamp (3 pies) from 1890-1891

Coat of Arms, Orange Free State

The Great Seal of the Orange Free State

Coat of Arms, Orange Free State

Orange Free State Stamp (3 pence) from 1888-1892

Orange Free State Drie Pence Stamp, 1888-1892

Orange Free State Stamp (3 pence) from 1888-1892

Orange Free State Revenue Stamp (1 shilling) from 1882

Orange Free State Een Shilling Revenue Stamp, 1882

Orange Free State Revenue Stamp (1 shilling) from 1882

Sweden Official Stamp (12 ore) from 1874

Sweden Tolf Ore Official Stamp, 1874

Sweden Official Stamp (12 ore) from 1874

The cow knocks down the dungeon wall with her horns to free Hans. This knocks his hat off but he quickly climbs out.

Hans the Innocent 9

The cow knocks down the dungeon wall with her horns to free Hans. This knocks his hat off but he quickly…

"Diagram of the progress of a dune, from a to be. The arrow flies with the wind. A live tree standing before the dune when it is at a will be buried by the advance to b. Another tree, previously killed and still covered by the dune, will be brought to light when it has reached b." -Johnson, 1910

Dune Progress

"Diagram of the progress of a dune, from a to be. The arrow flies with the wind. A live tree standing…

"Free cell formation of spores in the ascus of Erysiphe communis. A, ascus with single nucleus; C, cytoplasm; N, nucleus; NL, nucleolus; B, successive stages in nuclear division with the ascus; at X, early anaphase, nuclear membrane, NM, still persisting; R, kinoplasmic radiations from the poles; at Y, telophase, new nuclear membrane not yet formed; Z, a later stage where the nuclear membranes demark the daughter nuclei." -Stevens, 1916

E. Communis Cell

"Free cell formation of spores in the ascus of Erysiphe communis. A, ascus with single nucleus; C, cytoplasm;…

A: "Camera-lucida drawing of a bleached leaf of a Dicotyledon, showing the course of the vascular bundles, and how end free in the mesophyll." C:magnified detail. -Stevens, 1916

Dicotyledon Leaf

A: "Camera-lucida drawing of a bleached leaf of a Dicotyledon, showing the course of the vascular bundles,…

"One third of the sea bottom is covered with a soft gray ooze or mud made up entirely of the shells of minute animals which live in the surface waters."

Ooze

"One third of the sea bottom is covered with a soft gray ooze or mud made up entirely of the shells…

"The horizontal direction of the wind is usually observed by means of an instrument called the arrow wind vane, the head of the arrow pointing in the direction of approach of the wind. The arrow is free to revolve horizontally around a vertical axis placed near the head." -Waldo, 1896

Arrow Wind Vane

"The horizontal direction of the wind is usually observed by means of an instrument called the arrow…

Of the orpine family (Crassulaceae), the live-forever or garden orpine (Sedum purpureum).

Live-Forever or Garden Orpine

Of the orpine family (Crassulaceae), the live-forever or garden orpine (Sedum purpureum).

"Life history of a coral, Monoxenia darwinii. A, B, Ovum. C, Division into two. D, four-cell stage. E, Blastula. F, Free-swimming blastula with cilia. G, Section of blastula. H, Beginning of invagination. I, Section of completed gastrula, showing ectoderm, and archenteron. K, Free-swimming ciliiated gastrula." -Thomson, 1916

Coral Stages

"Life history of a coral, Monoxenia darwinii. A, B, Ovum. C, Division into two. D, four-cell stage.…

"Vorticella. 1. Structure. N., Macronucleus; n., micronucleus; c.v., contractile vacuole; m., mouth; f.v., food vacuole; v., vestibule. 2. Encysted individual. 3. Division. 4. Separation of a free-swimming unit--the result of a division. 5. Formation of eight minute units (mg.). 6. Conjugation of microzooid (mg.) with one normal size." -Thomson, 1916

Vorticella

"Vorticella. 1. Structure. N., Macronucleus; n., micronucleus; c.v., contractile vacuole; m., mouth;…

"Life history of Coccidium. 1. Sporozoite; 2. Sporozoite entering a cell and becoming a trophozoite; 3-4. Schizont, forming merozoites; 5. Merozoites entering another cell; 6a. Merozoite forming macrogamete; 6b. Merozoite forming microgametes; 7. Free microgamete; 8-9. Fertilisation of macrogamete by microgamete; 10. Zygote within oocyst; 11. Formation of spores within oocyst; 12. Spores forming sporozoites." -Thomson, 1916

Coccidium

"Life history of Coccidium. 1. Sporozoite; 2. Sporozoite entering a cell and becoming a trophozoite;…

"Diagrammatic representation of development of Oscarella lobularis. Bl., Free-swimming blastula with flagella; G., gastrula settled down. Next figure shows folding of inner layer (En.); Ec., outer layer. Lowest figure shows radial chambers (R.C.); Mesogloea (Mg.); inhalant pore (P.); exhalant osculum (O.)." -Thomson, 1916

O. Lobularis

"Diagrammatic representation of development of Oscarella lobularis. Bl., Free-swimming blastula with…

"Life history of liver fluke. 1. Developing embryo in egg-case; 2. free-swimming ciliated embryo; 3. sporocyst; 3a. shell of Limnaus truncatulus; 4. division of sporocyst; 5. sporocyst with rediae forming within it; 6. redia with more rediae forming within it; 7. tailed cercaria; 8. young fluke." -Thomson, 1916

Liver Fluke Stages

"Life history of liver fluke. 1. Developing embryo in egg-case; 2. free-swimming ciliated embryo; 3.…

"Free-living Polychaete (Nereis cultrifera)." -Thomson, 1916

Polychaete

"Free-living Polychaete (Nereis cultrifera)." -Thomson, 1916

"Diagram of Salpa africana. o.a., Oral aperture; d.t., dorsal tubercle; te., tentacle; g., ganglion; m., muscle bands; atr., atrium; b.v., blood-vessel; an., anus; a.a., exhalant aperture; v.n., visceral nucleus; h., heart st., stolon; d.l., dorsal lamina; E., endostyle; s.n.g., sub-neural gland; ph., pharynx; p.p.b., peri-pharyngeal band." -Thomson, 1916

Salpa Africana

"Diagram of Salpa africana. o.a., Oral aperture; d.t., dorsal tubercle; te., tentacle; g., ganglion;…

"Internal view of tortoise skeleton. H., humerus; SC., scapula running dorsally; PC., precoracoid; C., coracoid; EC., epicoracoid cartilage; P., pubis; IL., ilium running dorsally to sacral vertebrae; IS., ischium; DV., dorsal vertebrae fused in carapace; R., head of a rib; CEV., cervical vertebrae free; CAV., caudal vertebrae free." -Thomson, 1916

Tortoise Skeleton

"Internal view of tortoise skeleton. H., humerus; SC., scapula running dorsally; PC., precoracoid; C.,…

"Fore-limb and hind-limb compared. H., Humerus; R., radius; U., ulna; r., radiale; u., ulnare; C., distal carpals united to carpo-metacarpus; CC., the whole carpal region; MC.I., metacarpal of the thumb; I., phalanx of the thumb; MC.II., second metacarpus; II., second digit; MC.III., third metacarpus; III., third digit. F., femur; T.T., tibio-tarsus; Fi., fibula; Pt., proximal tarsals united to lower end of tibia; dt., distal tarsals nited to upper end of tarso-metatarsus (T.MT.); T., entire tarsal region; MT.I., first metatarsal, free; I.-IV., toes." -Thomson, 1916

Bird Limbs

"Fore-limb and hind-limb compared. H., Humerus; R., radius; U., ulna; r., radiale; u., ulnare; C., distal…

"Bones of hind-limb of eagle. f., Femur; t.t., tibio-tarsus; fb., fibula; a., ankle-joint; m.t., tarso-metatarsus; m.t'., first metatarsal (free)." -Thomson, 1916

Eagle Hind-Limb

"Bones of hind-limb of eagle. f., Femur; t.t., tibio-tarsus; fb., fibula; a., ankle-joint; m.t., tarso-metatarsus;…

"C, more mature condition, in which the planula has become fixed: f, foot or attached end; o, oral or free end at which the tentacles and mouth will be developed." -Galloway, 1915

Mature Hydroid Planula

"C, more mature condition, in which the planula has become fixed: f, foot or attached end; o, oral or…

"Vorticella. A, B, living specimens in different positions; C, optical section; D1, D2, diagrams illustrating coiling of stalk; E1, E2, two stages in binary fission; E3, free zooid; F1, F2, division into mega- and microzooids; G1, G2, conjugation; H1, multiple fission of encysted form; H2, H3, development of spores; ax. f, axial fibre; cort, cortex; cu, cuticle; c. vac, contractile vacuole; d, disc; gull, gullet; m, microzooid; mth, mouth; nu, meganucleus; per, peristome." -Parker, 1900

Vorticella

"Vorticella. A, B, living specimens in different positions; C, optical section; D1, D2, diagrams illustrating…

"Stages in the development of Laomedea; A-F stages in segmentation; G, the planula enclosed in the maternal tissues; H, the free-swimming planula." -Parker, 1900

Laomedea

"Stages in the development of Laomedea; A-F stages in segmentation; G, the planula enclosed in the maternal…

"Head of Hirudo medicinalis, showing the three jaws (k); b, one of the jaws isolated, with the finely toothed free edge." -Parker, 1900

Medical Leech

"Head of Hirudo medicinalis, showing the three jaws (k); b, one of the jaws isolated, with the finely…

"Diagram of the metamorphosis of the free, tailed larva into the fixed Ascidian. A, stage of free-swimming larva; B, larva recently fixed; C, older fixed stage. adh, adhesive papillae; atr, atrial cavity; cil. gr, ciliated groove; end, endostyle; ht, heart; med, ganglion of trunk; n. gn, nerve-ganglion; noto, notochord; or, oral aperture; rect, reectum; sens ves, sense vesicle; stig, stigmata; stol, stolon; t, tail." -Parker, 1900

Ascidian Stages

"Diagram of the metamorphosis of the free, tailed larva into the fixed Ascidian. A, stage of free-swimming…

A freshwater hydra, magnified. Example of an animal with no skeleton. There are animals without a skeleton that are not able to accomplish very powerful motions. Mot of them live in water where they are partly or wholly held up by the water and have only slow motions. Most are also very small and generally have no muscles.

Freshwater Hydra

A freshwater hydra, magnified. Example of an animal with no skeleton. There are animals without a skeleton…

The torture of a free mason. Caption below illustration: "They next set my back against a thick board, at each extremity of which was pulley; through which a rope ran, that was fastened at the end of the chain at my wrist. The tormentors then, stretching these ropes by means of a roller, pressed and bruised my stomach in proportion as the ropes were drawn tighter.

Torture of a Free Mason

The torture of a free mason. Caption below illustration: "They next set my back against a thick board,…

(1808-1873) American statesman, jurist, and member of the Free-Soil party.

Salmon Portland Chase

(1808-1873) American statesman, jurist, and member of the Free-Soil party.

"Prostyle, in architecture, applied to a portico in which the columns stand out quite free from the wall of the building to which it is attached; also applied to a temple or other structure having pillars in front only." -Marshall

Plan view of a Prostyle Temple

"Prostyle, in architecture, applied to a portico in which the columns stand out quite free from the…

A magnified block of the skin. Labels: a, dead part; d, live part of the epidermis; e, sweat glands; n, nerve endings.

Magnified Image of the Skin

A magnified block of the skin. Labels: a, dead part; d, live part of the epidermis; e, sweat glands;…

The skeleton of a haddock. In some species such as the haddock, there is a modified form of the coracoid bone, free at its lower extremities, which may, perhaps, subserve the purpose of the clavicle of the higher animals.

Skeleton of a Haddock

The skeleton of a haddock. In some species such as the haddock, there is a modified form of the coracoid…

The mucous membrane from the jejunum. Labels: 1, Villi (folds of lining mucous membrane) in miniature. 2, Tubular glands: their orifices. 3, Opening on the free surface of the mucous membrane. 4, Fibrous tissue.

Mucous Membrane from the Jejunum

The mucous membrane from the jejunum. Labels: 1, Villi (folds of lining mucous membrane) in miniature.…

Portion of the mucous membrane from the small intestine, magnified, showing the villi on its free surface, and between them the orifices of the tubular glands. Labels: 1, Portion of a clustered gland. 2, A solitary gland. 3, Fibrous tissue.

A Portion of the Mucous Membrane from the Small Intestine

Portion of the mucous membrane from the small intestine, magnified, showing the villi on its free surface,…

"Leaf of a live-forever (Sedum sp.), with a portion of the epidermis peeled back. Underneath the epidermis is the mesophyll." -Gager, 1916

Sedum Leaf

"Leaf of a live-forever (Sedum sp.), with a portion of the epidermis peeled back. Underneath the epidermis…

The vertical section of the stratified epithelium of the cornea of a rabbit. Labels: a, Anterior epithelium showing the different shapes of the cells at various depths from the free surface; b, a portion of the substance of cornea.

Epithelium of the Rabbit's Cornea

The vertical section of the stratified epithelium of the cornea of a rabbit. Labels: a, Anterior epithelium…

When a 2 percent fresh solution of tannic acid is applied to frog's blood it causes the appearance of a sharply defined little knob, projecting from the free surface (Robert's macula): the coloring matter becomes at the same concentrated in the nucleus, which grows more distinct. A somewhat similar effect is produced on the human blood corpuscle.

Effect of Tannin on Red Blood Cells

When a 2 percent fresh solution of tannic acid is applied to frog's blood it causes the appearance of…

The stethometer consists of a frame formed of two parallel steel bars joined by a third at one end. At the free end of the bars is attached a leather strap, by means of which the apparatus may be suspended from the neck. Attached to the inner end of one bar is a tambour and ivory button, to the end of the other an ivory button. When in use, the apparatus is suspended with the transverse bar posteriorly, the button of the tambour is placed on the part of the chest the movement of which it is desire to record, and the other button is made to press upon the corresponding side of the chest, so that the chest is held between a pair of callipers.

Stethometer

The stethometer consists of a frame formed of two parallel steel bars joined by a third at one end.…

Section of a mucous gland from the tongue. Labels: A, opening of the duct on the free surface; C, basement membrane with nuclei; B, flattened epithelial cells lining duct. The duct divides into several branches, which are convoluted and end blindly, being lined throughout by columnar epithelium. D, lumen of one of the tubuli of the gland.

Mucous Gland from Tongue

Section of a mucous gland from the tongue. Labels: A, opening of the duct on the free surface; C, basement…