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the sturgeon has a cylindrical body covered by rhomboidal bony scales that are coated with enamel, making a strong and complete armor.

Sturgeon

the sturgeon has a cylindrical body covered by rhomboidal bony scales that are coated with enamel, making…

"The overhead movement enables the swimmer to throw himself forward on the water, and to move his arms and legs in a nearly vertical instead of a horizontal plane; the extremities working, as it were, above and beneath the trunk, rather than on either side of it."—Pettigrew, 1874

Overhand Swimming

"The overhead movement enables the swimmer to throw himself forward on the water, and to move his arms…

"An improvement on the foregoing for long distances is the known as the side stroke. In this method, as the term indicates, the body is thrown more decidedly upon the side."—Pettigrew, 1874

Side-Stroke Swimming

"An improvement on the foregoing for long distances is the known as the side stroke. In this method,…

"Showing the distribution of some of the great plexuses of the sympathetic nerve in the lumbar and sacral regions." — Blaisedell, 1904

Plexuses of the Sympathetic Nerves

"Showing the distribution of some of the great plexuses of the sympathetic nerve in the lumbar and sacral…

Digestive system of a mammal. (g) gullet; (s) stomach; (sm) small intestine; (lm) large intestine; (r) termination of the large intestine.

Digestive system

Digestive system of a mammal. (g) gullet; (s) stomach; (sm) small intestine; (lm) large intestine; (r)…

Tail of fish. (a) homocercal tail (Sword fish)

fish tail

Tail of fish. (a) homocercal tail (Sword fish)

Tail of fish. (b) heterocercal tail (Sturgeon)

fish tail

Tail of fish. (b) heterocercal tail (Sturgeon)

Teeth of the right side of the lower jaw of the Chimpanzee. (i) incisors; (c) canine tooth; (pm) premolars; (m) molars.

Chimpanzee Teeth

Teeth of the right side of the lower jaw of the Chimpanzee. (i) incisors; (c) canine tooth; (pm) premolars;…

"Some of the Larger Muscles on the back of the Thigh. Powerful tendons at the hip and on the back of the knee are well shown." — Blaisedell, 1904

Thigh Muscles

"Some of the Larger Muscles on the back of the Thigh. Powerful tendons at the hip and on the back of…

"Human Thoracic Duct and Azygous Veins. a, receptacle of the chyle; b, trunk of the thoracic duct, opening at c into root of left innominate vein at junction of f, left jugular, and g, left subclavian vein; e, right innominate vein; d, d, d, several thoracic and lumbar lymphatic glands; h, h, a short portion of the esophagus. Two azygous veins run parallel with and on each side of the duct, until the left crosses behind the duct to join the right. The structures represented rest nearly upon the back-bone." -Whitney, 1911

Thoracic Duct

"Human Thoracic Duct and Azygous Veins. a, receptacle of the chyle; b, trunk of the thoracic duct, opening…

"The <em>ribs</em> are long, flat, and curved bones which bend round the chest somewhat like the hoops of a barrel. There are twenty-four ribs, twelve on each side." &mdash; Blaisedell, 1904

Thorax

"The ribs are long, flat, and curved bones which bend round the chest somewhat like the hoops…

"The <em>leg</em> consists, like the forearm, of two bones. The larger, a strong, three-sided bone with a sharp edge in front, is called the <em>tibia</em>. It is commonly known as the shin bone. The smaller bone, bound at both ends to the tibia, as a pin is to a brooch, is called the <em>fibula</em>, meaning a buckle or clasp. It is a long, slender bone on the outside of the leg, and is lower end forms the outer ankle." — Blaisedell, 1904

Tibia and Fibula

"The leg consists, like the forearm, of two bones. The larger, a strong, three-sided bone with…

"When a bone is broken, blood trickles out between the injured parts, and afterwards gives place to a sticky, watery fluid, which gradually becomes thicker, like a syrup or jelly. This is slowly replaced by a new bone structure and forms a kind of cement to gold together the broken ends." — Blaisedell, 1904

Broken Tibia

"When a bone is broken, blood trickles out between the injured parts, and afterwards gives place to…

"Along with white fibrous tissue, the yellow fibrous tissue... makes the coats of the arteries, and certain ligaments, elastic." &mdash; Blaisedell, 1904

Yellow elastic tissue

"Along with white fibrous tissue, the yellow fibrous tissue... makes the coats of the arteries, and…

The development of a toad, image 1.

Toad

The development of a toad, image 1.

The development of a toad, image 3.

Toad

The development of a toad, image 3.

The development of a toad, image 4.

Toad

The development of a toad, image 4.

The development of a toad, image 5.

Toad

The development of a toad, image 5.

An illustration of a human toes.

Toes

An illustration of a human toes.

<em>A</em>, epiglottis; <em>B</em>, glands at the base of tongue; <em>C</em>, tonsil; The various kinds of papillae are plainly shown." &mdash; Blaisedell, 1904

Tongue

A, epiglottis; B, glands at the base of tongue; C, tonsil; The various kinds…

"Larynx, Trachea, and the Bronchi. (Front view.) <em>A</em>, epiglottis; <em>B</em>, thyroid cartilage; <em>C</em>, cricothyroid membrane, connecting with the cricoid cartilage below, all forming the larynx; <em>D</em>, rings of the trachea." &mdash; Blaisedell, 1904

Trachea

"Larynx, Trachea, and the Bronchi. (Front view.) A, epiglottis; B, thyroid cartilage;…

"The <em>trachea</em> has in its walls stiff rings of cartilage that hold it open so that the air can pass freely through it to and from the lungs. At its base the trachea divides and sends a great branch to each lung." &mdash; Ritchie, 1918

Trachea and lungs

"The trachea has in its walls stiff rings of cartilage that hold it open so that the air can…

"A small bronchial tube and the air sacs in which it ends." &mdash; Ritchie, 1918

Bronchial tube

"A small bronchial tube and the air sacs in which it ends." — Ritchie, 1918

A pair of tweezers used for dissection.

Tweezers

A pair of tweezers used for dissection.

"The <em>ulna</em>, or elbow bone, is the larger of these two bones. It is joined to the humerus by a hinge joint at the elbow. It is on the same side as the little finger. The <em>radius</em>, queerly named because it is supposed to resemble one of the spokes of a wheel, is the long, slightly curved, outer bone fo the forearm. It is on the same side as the thumb. Its upper end is fastened both to the ulna and the humerus." — Blaisedell, 1904

Ulna and Radius

"The ulna, or elbow bone, is the larger of these two bones. It is joined to the humerus by…

In human anatomy, the ureters are muscular tubes that propel urine from the kidneys to the urinary bladder.

Transverse Section of Ureter

In human anatomy, the ureters are muscular tubes that propel urine from the kidneys to the urinary bladder.

"<em>A</em>, part of a vein laid open, with two pairs of valves; <em>B</em>, longitudinal section of a vein, showing the valves closed." &mdash; Blaisedell, 1904

Vein

"A, part of a vein laid open, with two pairs of valves; B, longitudinal section of…

"The Internal, or Long Saphenous, Vein of the Left Leg." &mdash; Blaisedell, 1904

Leg vein

"The Internal, or Long Saphenous, Vein of the Left Leg." — Blaisedell, 1904

"Chief veins and arteries of the body. a, place of the heart; the veins are in black. On the right side of the pictures the veins just under the skin oare shown and on the other side the deep vessels near the bones.. b, vessels to the lungs." &mdash;Davison, 1910

Veins and arteries

"Chief veins and arteries of the body. a, place of the heart; the veins are in black. On the right side…

A section of a human vertebra, showing structure.

Section of Vertebra

A section of a human vertebra, showing structure.

The vertebra of the whale. (c) body; (n n ) arches enclosing the spinal cord.

Whale vertebra

The vertebra of the whale. (c) body; (n n ) arches enclosing the spinal cord.

"Section of two lumbar vertebrae, showing ligaments."&mdash;Finley, 1917

Lumbar vertebrae

"Section of two lumbar vertebrae, showing ligaments."—Finley, 1917

"Ideal fore limb. H., Humerus; R., radius; U., ulna; r'., radiale; u'., ulnare; i., intermedium; c., centrale; 1-5, carpalia bearing the corresponding digits with metacarpals (mc.) and phalanges (ph)." -Thomson, 1916

Vertebrate Fore Limb

"Ideal fore limb. H., Humerus; R., radius; U., ulna; r'., radiale; u'., ulnare; i., intermedium; c.,…

"f., Femur; ti., tibia; fi., fibula; i., intermedium; t., tibiale (astragalus); f., fibulare (os calcis); c., centrale; 1-5, tarsalia bearing the corresponding digits with metatarsals (mt.) and phalanges (ph.)." -Thomson, 1916

Vertebrate Hind Limb

"f., Femur; ti., tibia; fi., fibula; i., intermedium; t., tibiale (astragalus); f., fibulare (os calcis);…

"Fore limbs of vertebrates showing similarity of structure. <em>A</em>, salamander; <em>B</em>, turtle; <em>C</em>, very young bird; <em>D</em>, adult bird; <em>E</em>, dog; <em>F</em>, man." &mdash; Davison, 1906

Forearms of vertebrates

"Fore limbs of vertebrates showing similarity of structure. A, salamander; B, turtle;…

"Ideal section, greatly enlarged, showing minute capillary circulations." &mdash;Brown, 1884

Villus

"Ideal section, greatly enlarged, showing minute capillary circulations." —Brown, 1884

"<em>A</em>, epiglottis; <em>B</em>, section of hyoid bone; <em>C</em>, false vocal cords which have nothing to do with the production of voice; <em>D</em>, oblong opening between the false and true vocal cords; <em>E</em>, true vocal cord;<em>F</em>, section of the thyroid cartilage; <em>H</em>, section of the anterior portion of the cricoid cartilage; <em>K</em>, trachea; <em>L</em>, section of the posterior portion of the cricoid cartilage; <em>M</em>, ladle-shaped cartilage." &mdash; Blaisedell, 1904

Vocal cords

"A, epiglottis; B, section of hyoid bone; C, false vocal cords which have…

This illustration shows the vocal cords, seen from above during quiet breathing (A. Thyroid Cartilage; B. Cricoid Cartilage; C. hyoid bone; D. Rings of trachea; E. Epiglottis; F. Arytenoid Cartilage; G. Thyro-arytenoid muscle; H. Adam's Apple; I. False Vocal Cords; J. True Vocal Cords; K. Ventricle; L. Rima Glottis).

Vocal Cords Seen from above During Quiet Breathing

This illustration shows the vocal cords, seen from above during quiet breathing (A. Thyroid Cartilage;…

"An expanded Alcyonarian Zooid, showing the mouth surrounded by eight pinnate tentacles. st, Stomodaeum in the center of the transparent body; m, mesenteries; asm, asulcar mesenteries; B, picules, enlarged." &mdash;Encyclopedia Britannica, 1910

Alcyonarian zooid

"An expanded Alcyonarian Zooid, showing the mouth surrounded by eight pinnate tentacles. st, Stomodaeum…