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Magnified view of some of a simple fresh water Alga, the Tetraspora lubrica, each sphere of which may answer to an individual plant.

Alga

Magnified view of some of a simple fresh water Alga, the Tetraspora lubrica, each sphere of which may…

Veins of the upper extremity . Labels: 1, axillary artery; 2, axillary veins; 3, 4, basilic; 5, point where median basilic joins basilic; 6, posterior basilic vein; 8, anterior basilic vein; 9, point where cephalic enters axillary; 10, portion same vein; 11, point where median cephalic enters cephalic; 12, lower portion cephalic vein; 13, median cephalic vein; 14, median vein; 15, anastromosing branch; 16, cephalica-pollicis veins; 17, veins of fingers; 18, palmar veins.

Veins of the Arm and Shoulder

Veins of the upper extremity . Labels: 1, axillary artery; 2, axillary veins; 3, 4, basilic; 5, point…

A portion of an artery.

Artery

A portion of an artery.

An illustration of a pinnule of aspidium showing veins and sori.

Pinnule of Aspidium

An illustration of a pinnule of aspidium showing veins and sori.

An illustration of a pinnule of aspenium showing veins and sori.

Pinnule of Asplenium

An illustration of a pinnule of aspenium showing veins and sori.

This illustration shows a representation of the circulation of the blood, in its essential features. The arrows indicate the course of the blood. a, arteries; aur., auricle or receiving portion of the heart; d, digestive tract; c. d., capillaries of the digestive tract; c.r., capillaries of the respiratory organs; c.s., capillaries of the system; va., valves; ve, veins; vt, ventricle.

Blood Circulation

This illustration shows a representation of the circulation of the blood, in its essential features.…

Diagram of the blood vascular system, showing that it forms a single closed circuit with two pumps in it, consisting of the right and left halves of the heart, which are represented separate in the diagram. Labels: ra and rv, right auricle and ventricle; la and lv, left auricle and ventricle; ao, aorta; sc, systemic capillaries; vc, venae cavae; pa, pulmonary artery; pc, pulmonary capillaries; pv, pulmonary veins.

Blood Vascular System

Diagram of the blood vascular system, showing that it forms a single closed circuit with two pumps in…

Magnified view of a portion of a transverse slice of stem of Calla Lily. The great spaces are tubular air-channels built up by the cells.

Calla Lily

Magnified view of a portion of a transverse slice of stem of Calla Lily. The great spaces are tubular…

Capillaries. 1: Vein; 2: Artery; 3: Capillary.

Capillaries

Capillaries. 1: Vein; 2: Artery; 3: Capillary.

Ideal construction of cellular tissue so formed, in section.

Cellular Tissue

Ideal construction of cellular tissue so formed, in section.

Diagram of circulation. Labels: L, left side of heart; R, right side of heart; a,a,a arterial system; b,b, capillaries; c,c,c veins; Alim., alimentary canal; Liv., liver; p, portal vein; H,hepatic vein; Lymph., lymphatic duct and tributaries; Pulm., lungs; Pa, pulmonary artery; Pu, pulmonary vein.

Diagram of Circulation

Diagram of circulation. Labels: L, left side of heart; R, right side of heart; a,a,a arterial system;…

Organs of the circulation system

Circulatory System

Organs of the circulation system

Magnified section through the thickness of a leaf of Florida Star-Anise.

Florida Star-Anise

Magnified section through the thickness of a leaf of Florida Star-Anise.

A large and a smaller dotted duct from Grape-Vine.

Grape-Vine

A large and a smaller dotted duct from Grape-Vine.

The heart is the organ that propels the blood and causes it to circulate through the arteries, veins, and capillaries.

Heart

The heart is the organ that propels the blood and causes it to circulate through the arteries, veins,…

External view of the Heart. 1: Right Auricle; 2: Left Auricle; 3: Right Ventricle; 4: Left Ventricle; 5: Systemic Veins; 6: Pulmonary Veins; 7: Aorta; 8: Pulmonary Artery; 9: Coronary Vein and Artery.

Heart

External view of the Heart. 1: Right Auricle; 2: Left Auricle; 3: Right Ventricle; 4: Left Ventricle;…

Section of Kidney. 1: Body of Kidney; 2: Internal vessels; 3: Ureter, leading to the bladder.

Kidney

Section of Kidney. 1: Body of Kidney; 2: Internal vessels; 3: Ureter, leading to the bladder.

Kidneys and their vessels. 1: Left kidney; 2: Ascending vein; 3: Aorta; 4: Left ureter; 5: Bladder.

Kidneys

Kidneys and their vessels. 1: Left kidney; 2: Ascending vein; 3: Aorta; 4: Left ureter; 5: Bladder.

"Fork-veined leaves are those in which the primary veins divide into two nearly equal secondary veins, forming a dork, and these subdivided in the same manner."—Darby, 1855

Fork-Veined Leaf

"Fork-veined leaves are those in which the primary veins divide into two nearly equal secondary veins,…

Veins of the leg. Labels: 1, saphenous; 2, collateral branch; 3, anastomosis; 4, internal saphenous; 5, original of saphenous; 6, anastomosing branch; 7, branches on back leg; 8, internal vein of foot; 9, arch veins on metatarsal bones; 10, branch from heel; 11, branches on sole of foot.

Veins of the Leg

Veins of the leg. Labels: 1, saphenous; 2, collateral branch; 3, anastomosis; 4, internal saphenous;…

Superficial veins of the legs. Labels: 1, saphena major; 2, collateral branch; 3, anastomosis of veins; 4, internal saphena; 5, origin of the saphena vein; 6, anastomosing branch; 7, branches on the back of the leg; 8, the great internal vein of the foot; 9, arch of veins on the metatarsal bones; 10, branch from the heel; 11, branches on the sole of the foot.

Veins of the Legs

Superficial veins of the legs. Labels: 1, saphena major; 2, collateral branch; 3, anastomosis of veins;…

The lymphatic vessels and glands. Labels: 1, 2, 3, 4, 5, 6, Lymphatic vessels and glands of the lower limb. 7, Lymphatic glands. 8, The receptacle of the thoracic duct. 9, The lymphatics of the kidney. 10, The stomach. 11, Of the liver. 12, Of the lungs. 13, 14, 15, The lymphatics and glands of the arm. 16, 17, 18, Of the face and neck. 19, 20, Large veins. 21, The thoracic duct.

The Lymphatic Vessels and Glands

The lymphatic vessels and glands. Labels: 1, 2, 3, 4, 5, 6, Lymphatic vessels and glands of the lower…

Much magnified small portion of young root of a seedling Maple.

Maple

Much magnified small portion of young root of a seedling Maple.

Magnified bit of a pine-shaving, taken parallel with the silver grain.

Pine-shaving

Magnified bit of a pine-shaving, taken parallel with the silver grain.

An illustration of a pinnule of polypodium showing veins and sori.

Pinnule of Polypodium

An illustration of a pinnule of polypodium showing veins and sori.

An illustration of a pinnule of pteris showing veins and sori.

Pinnule of Pteris

An illustration of a pinnule of pteris showing veins and sori.

Diagram of a vegetable cell, such as it would be if when spherical it were equally pressed by similar surrounding cells in a heap.

Vegetable Cell

Diagram of a vegetable cell, such as it would be if when spherical it were equally pressed by similar…

A portion of vein.

Vein

A portion of vein.

This illustration shows veins that have formed within rocks.

Vein-form Condition

This illustration shows veins that have formed within rocks.

This illustration shows a network of thin veins that have formed with a rock.

Vein-form Condition

This illustration shows a network of thin veins that have formed with a rock.

This illustration shows two very irregular veins. a represents regular veins, whereas b shows an intersecting irregular vein.

Vein-form Condition

This illustration shows two very irregular veins. a represents regular veins, whereas b shows an intersecting…

This illustration shows two large veins, of irregular character that cross one another.

Vein-form Condition

This illustration shows two large veins, of irregular character that cross one another.

This illustration shows a large band of veins within rock.

Vein-form Condition

This illustration shows a large band of veins within rock.

This illustration shows a large band of veins within rock.

Vein-form Condition

This illustration shows a large band of veins within rock.

The portal system of veins. a: Portal vein. b: Splenic vein. c: Right gastro-epiploic vein. d: Inferior mesenteric vein. e: Superior mesenteric vein. f: Trunk of the superior mesenteric artery. 1: Liver. 2: Stomach. 3: Spleen. 4: Pancreas. 5: Duodenum. 6: Ascending colon; the transverse colon is removed. 7: Small intestine. 8: Descending colon.

Veins

The portal system of veins. a: Portal vein. b: Splenic vein. c: Right gastro-epiploic vein. d: Inferior…

Chief veins and arteries of the body. Labels: a, place of the heart; the veins are in the back. On the right side of the picture the veins just under the skin are shown on the other side the deep vessels near the bones. b, vessels to the lungs.

Veins and Arteries of the Body

Chief veins and arteries of the body. Labels: a, place of the heart; the veins are in the back. On the…

Superficial veins of lower extremity. Labels: 1, veins of the foot; 2, internal saphenous vein; 3, superficial veins of calf; 4, superficial veins of thigh.

Superficial Veins of Leg

Superficial veins of lower extremity. Labels: 1, veins of the foot; 2, internal saphenous vein; 3, superficial…

Sketch of the principal venous trunks. Labels: 1, superior vena cava; , inferior vena cava; 3, right subclavian and innominate veins; 4, left subclavian and innominate veins; 5, 5, right and left internal jugular veins; 8, right azygos vein; 10, left azygos vein; 13, 13, common iliac veins; 14, 14, sacral veins.

Principal Venous Trunks

Sketch of the principal venous trunks. Labels: 1, superior vena cava; , inferior vena cava; 3, right…