A girl talking to a pig.

Girl with Pig

A girl talking to a pig.

Two children, a rooster, cat, and dog ride on a cow's back.

Children Riding a Cow

Two children, a rooster, cat, and dog ride on a cow's back.

A decorative border with a donkey being pulled, and then in the barn eating hay.

Donkey Border

A decorative border with a donkey being pulled, and then in the barn eating hay.

Two hedgehogs greet each other.

Hedgehog Couple

Two hedgehogs greet each other.

A hedgehog greets a snobby hare.

Hedgehog and Hare

A hedgehog greets a snobby hare.

A cat looking up at a robin.

Cat Looking at Bird

A cat looking up at a robin.

A squirrel digging up the dog's bones.

Dog and Squirrel

A squirrel digging up the dog's bones.

Hans is in a dungeon with horrid creatures.

Hans the Innocent 7

Hans is in a dungeon with horrid creatures.

A girl with a cat, chicken, dog, a toy cow, and a toy lion.

Girl and Animals

A girl with a cat, chicken, dog, a toy cow, and a toy lion.

"A deep-sea dredge. The iron lip of the sack scrapes shells mud, etc., into it, and small animals are caught by the "tangles."

Deep Sea Dredge

"A deep-sea dredge. The iron lip of the sack scrapes shells mud, etc., into it, and small animals are…

"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…

A girl holding a scared cat as a dog approaches.

Girl with Cat and Dog

A girl holding a scared cat as a dog approaches.

A lion, rabbit, hawk, all gather around the tree for a meeting held by the owl.

Animals Gathering

A lion, rabbit, hawk, all gather around the tree for a meeting held by the owl.

The silhouette illustration of the retired cat in "How Cats Came to Purr."

Retired Cat

The silhouette illustration of the retired cat in "How Cats Came to Purr."

A decorative divider with a man in the center, surrounded by plants and animals.

Man and Animals Divider

A decorative divider with a man in the center, surrounded by plants and animals.

A decorative divider with wheat in the center, surrounded by dogs, rabbits, and other plants.

Animal Divider

A decorative divider with wheat in the center, surrounded by dogs, rabbits, and other plants.

"Fish, trilobites, brachiopods, corals, and graptolites of the Palaeozoic epoch." -Taylor, 1904

Paleozoic Animals

"Fish, trilobites, brachiopods, corals, and graptolites of the Palaeozoic epoch." -Taylor, 1904

"Various species of Graptolites, from the Silurian rocks." -Taylor, 1904

Graptolites

"Various species of Graptolites, from the Silurian rocks." -Taylor, 1904

"Ideal landscape of the Triassic period." -Taylor, 1904

Triassic Landscape

"Ideal landscape of the Triassic period." -Taylor, 1904

"Ideal landscape of the Oolitic period." -Taylor, 1904

Jurassic Landscape

"Ideal landscape of the Oolitic period." -Taylor, 1904

"Ideal landscape of the Miocene period." -Taylor, 1904

Miocene Landscape

"Ideal landscape of the Miocene period." -Taylor, 1904

"Ideal landscape of the Quaternary period." -Taylor, 1904

Quaternary Landscape

"Ideal landscape of the Quaternary period." -Taylor, 1904

Some reptiles of the Late Paleozoic Age. The six-foot man is drawn to the same scale as the other animals.

Reptiles of the late Paleozoic age

Some reptiles of the Late Paleozoic Age. The six-foot man is drawn to the same scale as the other animals.

Some Mesozoic reptiles. Shown are the Brontosaurus, Stegosaurus, Pterodactyl, Camptosaurus, and the Diplodocus. The six-foot man is drawn to the same scale as the other animals.

Mesozoic Age Reptiles

Some Mesozoic reptiles. Shown are the Brontosaurus, Stegosaurus, Pterodactyl, Camptosaurus, and the…

Some Late Mesozoic reptiles. Shown are the Tyrannosaurus, Trachodon, Triceratops, Pterodactyls, and the Archaeopteryx. The six-foot man is drawn to the same scale as the other animals.

Late Mesozoic Age Reptiles

Some Late Mesozoic reptiles. Shown are the Tyrannosaurus, Trachodon, Triceratops, Pterodactyls, and…

Mammals from the Oligocene age. Shown are the Titanothere, Entelodont, Hyracodon, Uintathere, and the Hyaenodou. The six-foot man is drawn to the same scale as the other animals.

Mammals from the Oligocene Mammals

Mammals from the Oligocene age. Shown are the Titanothere, Entelodont, Hyracodon, Uintathere, and the…

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…

Plan of the body in cross-section. The systems in the body are arranged in a certain way which is the same in all animals which have a backbone. The plan of the bony skeleton is a central axis from which all other parts are extended. In this lies the central axis of the nervous system, from which its branches also extend.

Diagram of the Body Plan

Plan of the body in cross-section. The systems in the body are arranged in a certain way which is the…

"The Ferret was imported into Europe from Africa, and was well known to the Romans, being anciently employed, as it still is, in catching rabbits."

Ferret

"The Ferret was imported into Europe from Africa, and was well known to the Romans, being anciently…

Leather making consists essentially of the skins of animals chemically altered by the vegetable principle called tannin or tannic acid , so as to arrest decomposition.

Leather Making, the Tan-yard

Leather making consists essentially of the skins of animals chemically altered by the vegetable principle…

The name given to various animals included in the class Amphibia and in the order Urodela of that class. The salamanders may be divided into the land salamander and the water salamanders.

Cold Blooded Salamander

The name given to various animals included in the class Amphibia and in the order Urodela of that class.…

The name of animals of the class Arachnida. Scorpions have an elongated body, suddenly terminated by a long slender tail formed of six joints, the last of which terminates in an arcuated and very acute sting, which effuses a venomous liquid.

Arachnid Scorpion

The name of animals of the class Arachnida. Scorpions have an elongated body, suddenly terminated by…

Blood corpuscles of a frog. Highly magnified. The appearance of blood cells in different animals varies in shape and size.

Frog Blood Corpuscles

Blood corpuscles of a frog. Highly magnified. The appearance of blood cells in different animals varies…

The popular name given to a number of animals of the subkingdom Coelenterata and class Actinozoa, including the genus Actinia and other genera.

Sea Anemones

The popular name given to a number of animals of the subkingdom Coelenterata and class Actinozoa, including…

The name of a genus of gasteropodous mollusca. These animals are slug-like in appearance, and derive their popular name from the prominent character of the front pair of tentacles, which somewhat resemble the ears of a hare

Sea Hare

The name of a genus of gasteropodous mollusca. These animals are slug-like in appearance, and derive…

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…

A diagram of a mollusca. Mollusca are soft-bodied animals that are usually protected by an external skeleton or shell composed of carbonate of lime. Labels: 1, Alimentary canal. 2, Heart. 3, Cerebral ganglion. 4, Pedal ganglion. 5, Ganglion of digestive organs and muscles.

Diagram of a Mollusca

A diagram of a mollusca. Mollusca are soft-bodied animals that are usually protected by an external…

A diagram of a radiata (the starfish) whose organization is much less complete than that of most other animals. Label: 1, mouth.

Diagram of a Starfish

A diagram of a radiata (the starfish) whose organization is much less complete than that of most other…

The image on the left are the teeth of a carnivora or flesh-eating animal. The teeth on the right belong t a insectivora or insect-eating animal. Notice the projecting jaw, the wide mouth, and sharp teeth of the carnivore animal in contrast with the elongated, tapering muzzle and cone-pointed molars of the insectivorous animal.

Comparing Teeth of Carnivora and Insectivora Animals

The image on the left are the teeth of a carnivora or flesh-eating animal. The teeth on the right belong…

Ruminants (those animals that chew the cud), as the sheep, have a stomach with four cavities. Labels: 1, esophagus; 2, rumen; 3, reticulum; 4, omasum; 5, abomasum or rennet; 6, intestine.

The Stomach of a Sheep

Ruminants (those animals that chew the cud), as the sheep, have a stomach with four cavities. Labels:…

Ruminants (those animals that chew the cud), as the ox, have a stomach with four cavities. Labels: 1, The esophagus. 2, The rumen (paunch). 3, The reticulum (honeycomb). 4, The omasum (many-plies). 5, The abomasum(rennet). 6, The intestine.

Stomach of an Ox

Ruminants (those animals that chew the cud), as the ox, have a stomach with four cavities. Labels: 1,…

The illustration exhibits the typical characters of the red blood cells in the main divisions of Vertbrata. The fractions are those of an inch, and represent the average diameter. In the case of the oval cells, only the long diameter is here given. It is remarkable, that although the size of the red blood cells varies so much in the different classes of the vertebrate kingdom, that of the white corpuscles remains comparatively uniform, and thus are, in some animals, much greater, in others much less than the red corpuscles existing side by side with them.

Red Blood Cells in Vertebrata

The illustration exhibits the typical characters of the red blood cells in the main divisions of Vertbrata.…

"The animals have a well-developed shell, the form of which is elegant and delicate in structure. They are found in almost every sea, but abound chiefly in the Indian ocean and Oceania."

Bulla Ampulla (Linnaeus)

"The animals have a well-developed shell, the form of which is elegant and delicate in structure. They…

"The animals have a well-developed shell, the form of which is elegant and delicate in structure. They are found in almost every sea, but abound chiefly in the Indian ocean and Oceania."

Bulla Oblonga (Adams)

"The animals have a well-developed shell, the form of which is elegant and delicate in structure. They…

"The animals have a well-developed shell, the form of which is elegant and delicate in structure. They are found in almost every sea, but abound chiefly in the Indian ocean and Oceania."

Bulla Aspersa (Adams)

"The animals have a well-developed shell, the form of which is elegant and delicate in structure. They…

"In the genus <em>Cassis</em> the shell is oval, convex, and the spire is not of considerable height. These animals keep near the shore, in shallow water."

Cassis Glauca (Linnaeus)

"In the genus Cassis the shell is oval, convex, and the spire is not of considerable height.…

"In the genus <em>Cassis</em> the shell is oval, convex, and the spire is not of considerable height. These animals keep near the shore, in shallow water."

Cassis Rula (Linnaeus)

"In the genus Cassis the shell is oval, convex, and the spire is not of considerable height.…

"In the genus <em>Cassis</em> the shell is oval, convex, and the spire is not of considerable height. These animals keep near the shore, in shallow water."

Cassis Canaliculata (Brugieres)

"In the genus Cassis the shell is oval, convex, and the spire is not of considerable height.…

"In the genus <em>Cassis</em> the shell is oval, convex, and the spire is not of considerable height. These animals keep near the shore, in shallow water."

Cassis Madagascariensis (Lamarck)

"In the genus Cassis the shell is oval, convex, and the spire is not of considerable height.…

"In the genus <em>Cassis</em> the shell is oval, convex, and the spire is not of considerable height. These animals keep near the shore, in shallow water."

Cassis Madagascariensis (Lamarck)

"In the genus Cassis the shell is oval, convex, and the spire is not of considerable height.…

"In the genus <em>Cassis</em> the shell is oval, convex, and the spire is not of considerable height. These animals keep near the shore, in shallow water."

Cassis Zebra (Lamarck)

"In the genus Cassis the shell is oval, convex, and the spire is not of considerable height.…

"Cuttlefish are probably the most interesting animals of [the cephalopoda] order. They live for five or six years, and lay eggs, which are large and generally found in clusters, and are known to fishermen as sea-grapes."

Sepia Officinalis (Linnaeus)

"Cuttlefish are probably the most interesting animals of [the cephalopoda] order. They live for five…

"The lowest division of articulate animals is the Crustacea. Their name signifies a hard crust of covering, with which the animals are protected."

Zoea Taurus

"The lowest division of articulate animals is the Crustacea. Their name signifies a hard crust of covering,…

The giraffe is the tallest of all land animals.

Giraffe

The giraffe is the tallest of all land animals.

"The senses of touch, smell, taste and hearing are very slightly developed in birds. The organ of sight is indeed more highly developed in birds than in any other class of animals."

Internal Anatomy of Birds

"The senses of touch, smell, taste and hearing are very slightly developed in birds. The organ of sight…

"The falcons, it may be said, realize the ideal of a bird of prey. They feed only on living animals, birds or small mammals. They always hunt on the wing."

Red-Necked Falcon, or Turumdi (Falco Chiquera)

"The falcons, it may be said, realize the ideal of a bird of prey. They feed only on living animals,…

"When pressed by hunger it shows no fear in attacking live animals, which makes it dreaded by the shepherds along the coast of the Mediterranean."

The Fulvous Vulture

"When pressed by hunger it shows no fear in attacking live animals, which makes it dreaded by the shepherds…

"The Conversion of St. Eustace. By Albrecht D&uuml;rer. From the engraving on copper." -Heath, 1901

The Conversion of St. Eustace

"The Conversion of St. Eustace. By Albrecht Dürer. From the engraving on copper." -Heath, 1901

"The Knight, Death, and the Devil. By Albrecht D&uuml;rer. From the engraving on copper." -Heath, 1901

The Knight, Death, and the Devil

"The Knight, Death, and the Devil. By Albrecht Dürer. From the engraving on copper." -Heath, 1901

Three horses drinking water from a well.

Horses

Three horses drinking water from a well.