ClipArt ETC
"Parts of a feather. I., Four barbs (B.) bearing anterior barbules (A.BB.) and posterior barbules (P.BB.); II., six barbs (B.) in section, showing interlocking of barbules; III., anterior barbule with barbicels (H.)." -Thomson, 1916

Feather Parts

"Parts of a feather. I., Four barbs (B.) bearing anterior barbules (A.BB.) and posterior barbules (P.BB.);…

"Wing of dove. h., Humerus; s.f., secondary feathers; r., radius; u., ulna; c., carpals; mc., carpo-metacarpus; p.f., primary feathers." -Thomson, 1916

Dove Wing

"Wing of dove. h., Humerus; s.f., secondary feathers; r., radius; u., ulna; c., carpals; mc., carpo-metacarpus;…

"Brain of pigeon (I. dorsal, II. ventral, III. lateral aspects). OLF.L., Olfactory lobes; C.H., cerebral hemispheres; PB., pineal body; OL., optic lobes; CB., cerebellum; FL., flocculus or lateral extension of cerebellum; M.O., medulla oblongata; PIT., pituitary body at end of infundibulum (INF.); O.N., optic nerves crossing in the chiasma." -Thomson, 1916

Pigeon Brain

"Brain of pigeon (I. dorsal, II. ventral, III. lateral aspects). OLF.L., Olfactory lobes; C.H., cerebral…

"Female urogenital organs of pigeon. K., Kidney with three lobes; u., ureter; cl., cloaca; ov., ovary; od., oviduct; f.t., funnel at end of oviduct; r.r.od., rudimentary right oviduct." -Thomson, 1916

Female Pigeon Urogenital Organs

"Female urogenital organs of pigeon. K., Kidney with three lobes; u., ureter; cl., cloaca; ov., ovary;…

"Male urogenital organs of pigeon. T., testes; V., base of inferior vena cava; S.R., suprarenal bodies; K., kidneys with three lobes (1, 2, 3); u., ureter; v.d., vas deferens; vs., seminal vesicle; cl., cloaca." -Thomson, 1916

Male Pigeon Urogenital Organs

"Male urogenital organs of pigeon. T., testes; V., base of inferior vena cava; S.R., suprarenal bodies;…

"Diagram of foetal membranes. E., Embryo; H., gut lined by hypoblast, dotted-- the dark is mesoblast; UV., umbilical vesicle or yolk-sac; AC., amniotic cavity; am., amnion proper; sz., subzonal membrane; ALC., allantoic cavity; al., allantois; zp., may be here taken to represent the early epiblastic trophoblast. The figure does not show that the amnion folds consist of both epiblast and mesoblast." -Thomson, 1916

Mammal Fetus

"Diagram of foetal membranes. E., Embryo; H., gut lined by hypoblast, dotted-- the dark is mesoblast;…

"Side view of sheep's skull. PMX., Premaxilla; MX., maxilla; NA., nasal; J., Jugal; L., lachrymal; FR., frontal; PA., parietal; SQ., squamosal; CO., condyle; PP., paroccipital process." -Thomson, 1916

Sheep Skull

"Side view of sheep's skull. PMX., Premaxilla; MX., maxilla; NA., nasal; J., Jugal; L., lachrymal; FR.,…

"Stomach of sheep. a, OEsophagus; c, rumen or paunch; d, reticulum or honeycomb-bag; e, psalterium or many-plies; f, abomasum or reed; b, beginning of duodenum." -Thomson, 1916

Sheep Stomach

"Stomach of sheep. a, OEsophagus; c, rumen or paunch; d, reticulum or honeycomb-bag; e, psalterium or…

"Side view of horse's skull. P., Parietal; FR., frontal; NA., nasal; PMX., premaxilla; MX., maxilla; J., jugal; L., lachrymal; SQ., squamosal; PP., paroccipital process; CO., condyle CA., canine." -Thomson, 1916

Horse Skull

"Side view of horse's skull. P., Parietal; FR., frontal; NA., nasal; PMX., premaxilla; MX., maxilla;…

"Diagram showing the principal parts of the cell as it appeaers when killed and stained. The protoplasm shows more of a meshwork (cy), the spaces representing the alveoli. f, formed substance in alveoli." -Galloway, 1915

Cell Parts

"Diagram showing the principal parts of the cell as it appeaers when killed and stained. The protoplasm…

"Diagram illustrating gills or branchiae. b.c., cavity in which the body fluids circulate; br., branchial filaments which are merely much thinned out-pocketings of the body wall (w); ex, the external medium–water–in which the oxygen is dissolved." -Galloway, 1915

Gills or Branchiae

"Diagram illustrating gills or branchiae. b.c., cavity in which the body fluids circulate; br., branchial…

"Diagrams showing some of the stages in the increasing complexity of the simple eye in Invertebrates. A, simple pigment spot in epithelium having nerve-endings associated with pigment cells (as in some medusae); B, pigment cells in a pit-like depression (as in Patella); C, with pin-hole opening and vitreous humor in cavity (as in Trochus); D, completely closed pit, with lens and cornea (as in Triton and many other Mollusks); E, pigment area elevated instead of depressed, lens of thickened cuticula (as in the Medusa, Lizzia); F, retinal cells more highly magnified. ep., epidermis; f, nerve fibre; l, lens; op, optic nerve; p, pigment cells; r, retina; v.h., vitreous humor." -Galloway, 1915

Invertebrate Simple Eye

"Diagrams showing some of the stages in the increasing complexity of the simple eye in Invertebrates.…

"Diagram of Medusa, illustrating radial symmetry. A, viewed from the oral end of the principal axis; B, a section along the principal axis and through one of the subordinate axes aa1; o, ab. o, the oral and aboral poles of the principal axis; a, a1, and b, b1, the similar poles of the two chief subordinate axes." -Galloway, 1915

Medusa

"Diagram of Medusa, illustrating radial symmetry. A, viewed from the oral end of the principal axis;…

"A, Vorticella, a stalked ciliate Infusorian; I, contracted; 2, extended. f, food "vacuoles"; g, gullet; m, contractile fibre (muscular); n, nucleus; o, mouth, surrounded by ciliated disc; p.v., pulsating vacuole; s, stalk. B, a colonial type similar to Vorticella." -Galloway, 1915

Vorticella

"A, Vorticella, a stalked ciliate Infusorian; I, contracted; 2, extended. f, food "vacuoles"; g, gullet;…

"Diagrams to illustrate the development of one of the simpler types of sponge: I, the egg; 2, section of 16- to 32-celled stage; 3, section of later stage, a ciliated larva (blastula); 4, gastrula; 5, section through older larva which has become attached by the end containing the blastopore. New openings break through by the coalescence and perforation of the ectoderm and entoderm, and and a form results... a, archenteron; bl., blastopore; ec., ectoderm; en., entoderm; mes., mesenchyma; s, segmentation cavity." -Galloway, 1915

Simple Sponge Development

"Diagrams to illustrate the development of one of the simpler types of sponge: I, the egg; 2, section…

Diagram showing the Ascon type of sponge. ec., ectoderm; r.c., radiating canals; i.p., internal pores; mes., mesenchyma, e.p., external pores.

Ascon Sponge

Diagram showing the Ascon type of sponge. ec., ectoderm; r.c., radiating canals; i.p., internal pores;…

Diagram showing the Sycon type of sponge. ec., ectoderm; r.c., radiating canals; i.p., internal pores; mes., mesenchyma, e.p., external pores; en1, entoderm; en2, flagellate entoderm; f.c., flagellate chambers.

Sycon Sponge

Diagram showing the Sycon type of sponge. ec., ectoderm; r.c., radiating canals; i.p., internal pores;…

"A, Longitudinal section through the body of Hydra (diagrammatic). B, small portion of the wall more highly magnified. b, bud; ect., ectoderm; ent., entoderm; f, foot; fl., flagellum; g.v., gastro-vascular cavity; m., mouth; mes., mesenchyma (non-cellular); m.f., muscular processes of the ectodermal cells; n, nettling cells; n', same, exploded; nu., nucleus; t, tentacle; v, vacuole." -Galloway, 1915

Hydra

"A, Longitudinal section through the body of Hydra (diagrammatic). B, small portion of the wall more…

"Helix. B, the relation of the animal to the shell when extended...a, apex of shell; an., anus; e, eyestalk; f, foot; l, lip of shell; m, edge of mantle, which secretes the shell; r.a., respiratory aperture; t, tentacles." -Galloway, 1915

Helix Snail

"Helix. B, the relation of the animal to the shell when extended...a, apex of shell; an., anus; e, eyestalk;…

"Diagram showing the heart and general course of the circulation in the lamellibranchs. Only a short section is shown. a, auricle (right), with slit to ventricle; b, the body (region of spaces, lacunae, capillaries; v, the ventricle from which arteries pass forward and their capillaries; m, the mantle and capillaries; v, ventricle from which arteries pass forward and backward; v.c., "vena cava," in which the blood collects on returning from the tissues of the body." -Galloway, 1915

Bivalve Circulation

"Diagram showing the heart and general course of the circulation in the lamellibranchs. Only a short…

"The Devil-fish (Octopus). A, at rest; B, swimming. a, arms, with suckers on the inner aspect; e, eye; s, siphon or funnel." -Galloway, 1915

Octopus

"The Devil-fish (Octopus). A, at rest; B, swimming. a, arms, with suckers on the inner aspect; e, eye;…

"The Paper Nautilus (Argonauta argo). e, eye; m, mouth; f, siphon; sh, shell; t, tentacles." -Galloway, 1915

Paper Nautilus

"The Paper Nautilus (Argonauta argo). e, eye; m, mouth; f, siphon; sh, shell; t, tentacles." -Galloway,…

Illustration used to prove that "If two sides of a triangle are unequal, the angle opposite the greater side is greater than the angle opposite the less side."

Sides of Triangle Theorem

Illustration used to prove that "If two sides of a triangle are unequal, the angle opposite the greater…

"Diagram of the anatomy of Amphioxus, drawn as a semi-transparent object. a, anus; a.p., atrial pore; c.f., caudal fin; cir., cirri, on the edge of the vestibule leading to the mouth; d.f., dorsal fin; r, fin rays; g, gill or branchial structures consisting of alternate slits, through which the water passes, and supporting pates, in the walls of which are the blood vessels; in., intestine, from which as a diverticulum springs l., the liver; m, the mouth surrounded by a ringed velum; my., myotomes or muscle segments; n.c., notochord; o., ovaries; s.c., spinal cord; v.f., ventral fin." -Galloway, 1915

Lancelet

"Diagram of the anatomy of Amphioxus, drawn as a semi-transparent object. a, anus; a.p., atrial pore;…

"Diagrams of the structure of the heart in the lower Vertebrates. A, primitive condition; B, the position of the parts in the fishes. a, artery; au., auricle; c, conus arteriosus with valves; s.v., sinus venosus; v, valves; ve., vein; vent., ventricle. The dorsal portion of the heart is toward the bottom of the figure." -Galloway, 1915

Vertebrate Heart

"Diagrams of the structure of the heart in the lower Vertebrates. A, primitive condition; B, the position…

"Diagram of the heart, the branchial arches, and the principal veins in the Teleosts. Ventral view. The heart is represented without the sigmoid flexure; that is, with the auricle posterior. a, aorta; au., auricle; br.a., branchial arches of the aorta (1-4, numbering from the front); c, carotid; c.v., cardinal veins (right and left); d.a., dorsal arteries; j, jugular veins; d.c., ductus Cuvieri; s.v., sinus venosus; v, ventricle. Only four arterial arches are shown." -Galloway, 1915

Teleost Heart

"Diagram of the heart, the branchial arches, and the principal veins in the Teleosts. Ventral view.…

"Diagram of heart and branchial arches in Ceratodus (one of the Dipnoi). a.b., air bladder (lung); p.a., pulmonary artery; p.c., post caval vein (right); p.v., pulmonary vein...a, aorta; au., auricle; c, carotid; c.v., cardinal veins (right and left); d.a., dorsal arteries; j, jugular veins; d.c., ductus Cuvieri; s.v., sinus venosus; v, ventricle." -Galloway, 1915

Queensland Lungfish Heart

"Diagram of heart and branchial arches in Ceratodus (one of the Dipnoi). a.b., air bladder (lung); p.a.,…

"Diagram of the heart and branchial arches in Protopterus (one of the Dipno). pre.c., precaval vein, made up of right and left jugulairs, subclavians, etc.; post.c., postcaval, made up the cardinals, right and left...a, aorta; au., auricle; c, carotid; c.v., cardinal veins (right and left); d.a., dorsal arteries; j, jugular veins; d.c., ductus Cuvieri; s.v., sinus venosus; v, ventricle." -Galloway, 1915

African Lungfish Heart

"Diagram of the heart and branchial arches in Protopterus (one of the Dipno). pre.c., precaval vein,…

"Diagram of the heart and branchial arches in the Frog. c.g., carotid gland; l., lungs; l.a., left auricle; r.a., right auricle...a, aorta; au., auricle; c, carotid; c.v., cardinal veins (right and left); d.a., dorsal arteries; j, jugular veins; d.c., ductus Cuvieri; s.v., sinus venosus; v, ventricle." -Galloway, 1915

Frog Heart

"Diagram of the heart and branchial arches in the Frog. c.g., carotid gland; l., lungs; l.a., left auricle;…

"Diagram of the heart and branchial arches in a Reptile...a, aorta; au., auricle; c, carotid; c.v., cardinal veins (right and left); d.a., dorsal arteries; j, jugular veins; d.c., ductus Cuvieri; s.v., sinus venosus; v, ventricle." -Galloway, 1915

Reptile Heart

"Diagram of the heart and branchial arches in a Reptile...a, aorta; au., auricle; c, carotid; c.v.,…

"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…

"Diagram of a cross-section of the spinal cord through the roots of spinal nerves. c, central canal; d.f., dorsal fissure; d.r., dorsal root of spinal nerve arising from the dorsal horn of the gray matter (g); gn., ganglion on the dorsal root; n, spinal nerve; v.f., ventral fissure; v.r., ventral root of the spinal nerve, arising from the ventral horn of the gray matter; w., white matter." -Galloway, 1915

Spinal Cord

"Diagram of a cross-section of the spinal cord through the roots of spinal nerves. c, central canal;…

"Diagram of a longitudinal section through the embryo of a fowl, showing formation of amnion and allantois and the relation of these membranes to the embryo. am1, inner or true amnion; am2, outer or false amnion; am.c., amniotic cavity; al., allantois; c.c., central canal of the spinal cord; co., coelom; g, gut; ys., yolk sac." -Galloway, 1915

Fowl Embryo

"Diagram of a longitudinal section through the embryo of a fowl, showing formation of amnion and allantois…

"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…

The sexual system of a plant, here having seven stamens, Heptandria.

Linnaeus' Heptandria

The sexual system of a plant, here having seven stamens, Heptandria.

The sexual system of a plant, here having eight stamens, Octandria.

Linnaeus' Octandria

The sexual system of a plant, here having eight stamens, Octandria.

The sexual system of a plant, here having nine stamens, Enneandria.

Linnaeus' Enneandria

The sexual system of a plant, here having nine stamens, Enneandria.

The sexual system of a plant, here having ten stamens and a carpel, Decandria.

Linnaeus' Decandria

The sexual system of a plant, here having ten stamens and a carpel, Decandria.

The sexual system of a plant, here having many stamens, Dodecandria.

Linnaeus' Dodecandria

The sexual system of a plant, here having many stamens, Dodecandria.

The sexual system of a plant, here having twenty or more stamens, Icosandria.

Linnaeus' icosandria

The sexual system of a plant, here having twenty or more stamens, Icosandria.

The sexual system of a plant, here having many stamens with a pistil in the center, Polyandria.

Linnaeus' Polyandria

The sexual system of a plant, here having many stamens with a pistil in the center, Polyandria.

The sexual system of a plant, here having four stamens of unequal length, Didynamia.

Linnaeus' Didynamia

The sexual system of a plant, here having four stamens of unequal length, Didynamia.

The sexual system of a plant, here having six stamens (four longer), Tetradinamia.

Linnaeus' Tetradinamia

The sexual system of a plant, here having six stamens (four longer), Tetradinamia.

The sexual system of a plant, here having stamens united in a tube, Monadelphia.

Linnaeus' Monadelphia

The sexual system of a plant, here having stamens united in a tube, Monadelphia.

The sexual system of a plant, here having stamens united in two bundles, Diadelphia.

Linnaeus' Diadelphia

The sexual system of a plant, here having stamens united in two bundles, Diadelphia.

The sexual system of a plant, here having stamens united in three or more bundles, Polyadelphia.

Linnaeus' Polyadelphia

The sexual system of a plant, here having stamens united in three or more bundles, Polyadelphia.

The sexual system of a plant, here having stamens united by anthers, Syngenesia.

Linnaeus' Syngenesia

The sexual system of a plant, here having stamens united by anthers, Syngenesia.

The sexual system of a plant, here having stamens united with the pistil, Gynandria.

Linnaeus' Gynandria

The sexual system of a plant, here having stamens united with the pistil, Gynandria.

The sexual system of a plant, here having stamens and pistils in two different flowers of the same plant, Monoecia.

Linnaeus' Monoecia

The sexual system of a plant, here having stamens and pistils in two different flowers of the same plant,…

The sexual system of a plant, here having stamens and pistils on two different plants, Dioecia.

Linnaeus' Dioecia

The sexual system of a plant, here having stamens and pistils on two different plants, Dioecia.

The sexual system of a plant, here having both hermaphrodite and unisexual flowers on the same plant, Polygamia.

Linnaeus' Polygamia

The sexual system of a plant, here having both hermaphrodite and unisexual flowers on the same plant,…

The sexual system of a plant, here having hidden reproductive organs, Cryptogamia.

Linnaeus' Cryptogamia

The sexual system of a plant, here having hidden reproductive organs, Cryptogamia.

A flower spike.

Flower Spike

A flower spike.

"Tube nectary of Nasturtium." -Newman, 1850

Nasturtium

"Tube nectary of Nasturtium." -Newman, 1850

The sabiate of a flower.

Sabiate

The sabiate of a flower.

The lyme of a flower.

Lyme

The lyme of a flower.

The head of a flower.

Head

The head of a flower.

The perianth of a flower.

Perianth

The perianth of a flower.

The narcissus of a flower.

Narcissus

The narcissus of a flower.