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Vertical section of blastoderm of chick (1st day of incubation). S, epiblast consisting of short columnar cells; D, hypoblast, consisting of a single layer of flattened cells; M, formative cells." They are seen on the right of the figure, passing in between the epiblast and hypoblast to form the mesoblast; A, white yolk granules. Many of the large "formative cells" are seen containing these granules.

Blastoderm of a Chick

Vertical section of blastoderm of chick (1st day of incubation). S, epiblast consisting of short columnar…

Diagram of development of spinal cord. Labels: c, central canal; af, anterior fissure; pf, posterior fissure; g, gray matter; w, white matter.

Development of the Spinal Cord

Diagram of development of spinal cord. Labels: c, central canal; af, anterior fissure; pf, posterior…

The larva is the stage right after the eggs are laid. In this stage, the larva is white and legless.

Red Wood Ant Larva

The larva is the stage right after the eggs are laid. In this stage, the larva is white and legless.

"The Marbled Turbo is the largest shell in the group. It is marbled green, white and brown outside, and superbly nacred inside."

Turbo Marmoratus (Linnaeus)

"The Marbled Turbo is the largest shell in the group. It is marbled green, white and brown outside,…

"The Episcopal Miter, from the Indian ocean is white, ornamented with square spots of a fine red, and capable of high polish. It emits a purple liquid, having a nauseous odor, when irritated."

Mitra Episcopalis (Lamarck)

"The Episcopal Miter, from the Indian ocean is white, ornamented with square spots of a fine red, and…

"The Angel-winged is shown [here]. It is veined with stripes of white and red, and comes from the coasts of Asia and America."

Strombus Gallus (Linn.)

"The Angel-winged is shown [here]. It is veined with stripes of white and red, and comes from the coasts…

(1850-1895) American writer and humorist best known for his poems for children.

Eugene Field

(1850-1895) American writer and humorist best known for his poems for children.

"The White Ray is in the form of a rhomb, the point of the muzzle forming the lower angle, the longest ray of each pectoral forming the lateral angles, while the summit of the tail forms the last angle."

The White Ray (Raia Batis)

"The White Ray is in the form of a rhomb, the point of the muzzle forming the lower angle, the longest…

"Gadwall, a rather large fresh-water duck, common in the interior of the United States and breeding north of the latitude of Kentucky. It is a black and white duck, marked with brown, and is one of the favorite game birds." -Foster, 1921

Gadwall

"Gadwall, a rather large fresh-water duck, common in the interior of the United States and breeding…

"In birds of prey the claws are powerful and hooked; in others the foot is flat, claws straight, and adapted for walking."

Foot of White-Headed Eagle

"In birds of prey the claws are powerful and hooked; in others the foot is flat, claws straight, and…

1. Greater Tit (Parus Major) 2. Blue Tit (P. Coeruleus) 3. Crested Tit (P. Cristatus) 4. Marsh-Tit (P. Palustris) 5. Coal-Tit (P. Ater)

Birds

1. Greater Tit (Parus Major) 2. Blue Tit (P. Coeruleus) 3. Crested Tit (P. Cristatus) 4. Marsh-Tit (P.…

"The Bernicle-goose is so called from a foolish tradition of the middle ages of their being produced from the barnacle-shell, which attaches itself to ships' bottoms and timber floating in the sea."

White-Fronted Bernicle

"The Bernicle-goose is so called from a foolish tradition of the middle ages of their being produced…

"The Great Black-backed Gull is one of the most remarkable among sea-gulls. It is pure white, with a black back.

Great Black-backed Gull

"The Great Black-backed Gull is one of the most remarkable among sea-gulls. It is pure white, with a…

"They are shy, timid birds, concealing themselves by day in the depths of the mots retired woods."

Woodcocks (White and Isabelle-colored)

"They are shy, timid birds, concealing themselves by day in the depths of the mots retired woods."

"Its flight is as powerful as that of the golden eagle, and its adroitness and strength are even greater. This eagle is the chosen emblem of the United States."

Bald or White-headed Eagle (Haliaetus Leucocephalus)

"Its flight is as powerful as that of the golden eagle, and its adroitness and strength are even greater.…

The Blue Boy, a painting by Thomas Gainsborough painted in 1770.

The Blue Boy

The Blue Boy, a painting by Thomas Gainsborough painted in 1770.

"The Great White Horse. By Albrect Dürer. From the engraving on copper." -Heath, 1901

The Great White Horse

"The Great White Horse. By Albrect Dürer. From the engraving on copper." -Heath, 1901

"The eggs are white and conical. They adhere to the horse's hair."

Eggs of Gadfly, Estrus (Gasterophilus) Equi

"The eggs are white and conical. They adhere to the horse's hair."

"By catching one of these flies, and pressing the thorax between the finger and thumb, it is forced to put out its tongue."

Blue-Bottle Fly (Calliphora Vomitoria)

"By catching one of these flies, and pressing the thorax between the finger and thumb, it is forced…

"This trunk, or tongue, may be looked upon as the mouth of the insect."

Retractile Proboscis of Blue-Bottle Fly

"This trunk, or tongue, may be looked upon as the mouth of the insect."

"From the eggs deposited come small, white grubs, which leave their nest in the wood to bury themselves in the ground."

Larva of the Cicada

"From the eggs deposited come small, white grubs, which leave their nest in the wood to bury themselves…

"The Green-veined White Butterfly is very like the cabbage butterfly. Its caterpillar lives near the regions of perpetual snow."

Pieris Napi

"The Green-veined White Butterfly is very like the cabbage butterfly. Its caterpillar lives near the…

"The Orange-tips have, in the males, the extremity of the upper wings of a beautiful orange yellow. The rest of the wing is white."

Anthocharis Cardamines

"The Orange-tips have, in the males, the extremity of the upper wings of a beautiful orange yellow.…

"Common in France. The charming Blue Butterflies are more commonly met with."

Polyommatus (Lycaena) Virgaureae

"Common in France. The charming Blue Butterflies are more commonly met with."

"The Blue Argus, usually to be found in May and August."

Lycaena (Polyommatus) Corydon

"The Blue Argus, usually to be found in May and August."

"Nature, pervades the air, where grow the modest blue-eyed violets, the fragrant trailing arbutus, spicy and sweet, the funny Jack-in-the-pulpit, without which no collection of wild flowers would be complete, and there also maybe found the rare and beautiful bloodroot, whose stay is so short one can scarce catch a glimpse of its pure, white blossoms ere they vanish." -Beard, 1906

Bloodroot flower

"Nature, pervades the air, where grow the modest blue-eyed violets, the fragrant trailing arbutus, spicy…

The best silkworm cocoons "are drawn in toward the middle, or have a concavity on either side. There are white and yellow cocoons, the produce of different species of worms."

Cocoon of Bombyx Mori Drawn in Toward the Middle

The best silkworm cocoons "are drawn in toward the middle, or have a concavity on either side. There…

Amole has a cluster of thick spiny-margined leaves, from which arises a stem an inch or two in diameter, bearing at the top a showy pancle of creamy white flowers.

Amole (agave parryi)

Amole has a cluster of thick spiny-margined leaves, from which arises a stem an inch or two in diameter,…

"The Lackey derives its name from the color of the caterpillar, which has longitudinal lines of various colors and a blue head."

The Lackey (Bombyx Neustria)

"The Lackey derives its name from the color of the caterpillar, which has longitudinal lines of various…

The floor plan for the basement of a Pennsylvanian barn.

The Pennsylvanian barn

The floor plan for the basement of a Pennsylvanian barn.

Horsemen, Three Abreast, with Banners, from the engraving 'The Triumphal Procession' by Hans Burgkmair.

Horsemen, Three Abreast, with Banners

Horsemen, Three Abreast, with Banners, from the engraving 'The Triumphal Procession' by Hans Burgkmair.

An illustration of a blue rock-dove.

Blue rock-dove

An illustration of a blue rock-dove.

"The male weighs as much as thirty workers, and attains the length of nearly four-fifths of an inch."

Termes Lucifugus, Male

"The male weighs as much as thirty workers, and attains the length of nearly four-fifths of an inch."

"The workers are one fifth of an inch long; the body soft and of extreme delicacy, but the sharp mandibles are capable of attacking the hardest bodies."

Termes Lucifugus, Worker

"The workers are one fifth of an inch long; the body soft and of extreme delicacy, but the sharp mandibles…

"The soldiers are twice as long, and weigh as much as fifteen workers. They may be distinguished by their horned head and sharp pincers."

Termes Lucifugus, Soldier

"The soldiers are twice as long, and weigh as much as fifteen workers. They may be distinguished by…

"The female attains to six inches in length, and weighs as much as thirty thousand workers. It is an increase in the size of the abdomen alone. She produces sixty eggs a minute, more than eighty thousand a day."

Termes Lucifugus, Female

"The female attains to six inches in length, and weighs as much as thirty thousand workers. It is an…

"An insect among the Neuroptera, which undergo incomplete metamorphoses. These flutter about the banks of rivers and settle on stones, shrubs and aquatic plants."

Larva of Perla Bicaudata

"An insect among the Neuroptera, which undergo incomplete metamorphoses. These flutter about the banks…

"An insect among the Neuroptera, which undergo incomplete metamorphoses. These flutter about the banks of rivers and settle on stones, shrubs and aquatic plants."

Larva of Nemoura

"An insect among the Neuroptera, which undergo incomplete metamorphoses. These flutter about the banks…

"An insect among the Neuroptera, which undergo incomplete metamorphoses. These flutter about the banks of rivers and settle on stones, shrubs and aquatic plants."

Larva of Perla Marginata

"An insect among the Neuroptera, which undergo incomplete metamorphoses. These flutter about the banks…

"The adult lives only a few days, for its mouth is not suited for receiving food."

Perla Bicaudata

"The adult lives only a few days, for its mouth is not suited for receiving food."

"The adult dragon-fly coming out of the nymph."

Libellula Emerging

"The adult dragon-fly coming out of the nymph."

"Ant-lions diffuse an odor of roses. Their flight, which is weak, distinguishes them from the dragon-fly."

Ant Lion (Myrmeleo Formicarius)

"Ant-lions diffuse an odor of roses. Their flight, which is weak, distinguishes them from the dragon-fly."

"A very beautiful species of the ant-lion is to be found in the climate which characterizes the south of France; its larva can move forward, and does not dig itself a funnel."

Antlion

"A very beautiful species of the ant-lion is to be found in the climate which characterizes the south…

"It resembles a large gnat. They are found on hedges and plants during the summer."

Bittacus Tipularis

"It resembles a large gnat. They are found on hedges and plants during the summer."

The zebra is an ungulate from the Equidae family known for its black and white stripes.

Zebra

The zebra is an ungulate from the Equidae family known for its black and white stripes.

The blue and yellow macaw is a group of large parrots, here hanging upside down from a tree branch.

Blue and Yellow Macaw

The blue and yellow macaw is a group of large parrots, here hanging upside down from a tree branch.

The yellow-crested cockatoo is from the order of true parrots and is known for its white feathers and yellow crest.

Yellow-Crested Cockatoo

The yellow-crested cockatoo is from the order of true parrots and is known for its white feathers and…

The white stork (Ciconia ciconia) is a large wading bird in the stork family (Ciconiidae).

White Stork

The white stork (Ciconia ciconia) is a large wading bird in the stork family (Ciconiidae).

The Northern bluefin tuna (Thunnus thynnus) is a species of tuna native to the Atlantic Ocean, the Mediterranean Sea, and the Black Sea.

Northern Bluefin Tuna

The Northern bluefin tuna (Thunnus thynnus) is a species of tuna native to the Atlantic Ocean, the Mediterranean…

The great white shark (Carcharodon carcharias) is a large shark found in all major oceans.

Great White Shark

The great white shark (Carcharodon carcharias) is a large shark found in all major oceans.

The wentletrap is a small, white, spiraled gastropod mollusk.

Wentletrap

The wentletrap is a small, white, spiraled gastropod mollusk.

"It is not unusual to fine a decayed spot in the center of potatoes otherwise apparently in good condition. A microscopic examination a portion of the diseased part will show that the decay commenced where the vascular bundles concentrate. At that point the air is in greater volume than elsewhere. Although these mineral acids and caustic alkalies dissolve starch granuals, they do not affect the cellulose cells which contain the starch. When such spots are exposed to the atmosphere the fungus blue-mold forms on the surface. This disease, therefore, has not relation to potato-rot, as ordinarily understood. f represents the mycelium (roots) of blue-mold, Penicillium glaucum, and G that of potato-rot, Peronospora infestans." -Watts, 1874

Potato Diseases at a Microscopic Level

"It is not unusual to fine a decayed spot in the center of potatoes otherwise apparently in good condition.…

"The Blue Minyad is a type of a family in which the base of the body, in place of extending itself in a disk-like form, in order to grapple with the rocks and other projections at the bottom of the sea, turns itself inward, forming a sort of purse, which seems to imprison the air. From this results a sort of hydrostatic apparatus, aided by which the animals can float in the water and transport themselves from one place to another."

Blue Minyad (Minyas Cyanea)

"The Blue Minyad is a type of a family in which the base of the body, in place of extending itself in…

"The whole internal cavity in these animals is occupied by little, white tubes. The mouth opens at the extremity of the body; it forms a sort of funnel, surrounded like a crown with an elegant circle of tentacula."

Cristatella Mucedo (Cuvier)

"The whole internal cavity in these animals is occupied by little, white tubes. The mouth opens at the…

The outstanding geologic features of the park are the ancient sedimentary beds of red and white sandstones, conglomerates and limestone that were deposited horizontally, but have now been tilted vertically and faulted by the immense mountain building forces caused by the uplift of the Pikes Peak massif.

Cathedral Spires in the Garden of the Gods, Colorado

The outstanding geologic features of the park are the ancient sedimentary beds of red and white sandstones,…

Distribution of the cortical arteries. Labels" 1, Medullary arteries; 1', Group of medullary arteries in the sulcus between tow adjacent convolutions; 1", Arteries situated among the short association fibers. 2, Cortical arteries; a, Capillary network with fairly wide meshed, situated beneath the pia; b, Network with more compact, polygonal meshes, situated in the cortex; c, Transitional network, with wider meshes; d, Capillary network in the white substance.

Cortical Arteries

Distribution of the cortical arteries. Labels" 1, Medullary arteries; 1', Group of medullary arteries…

The Tobas wear but little clothes, except when they come into the presence of white people or cross the Paraguay river to trade. These Indians are very tall, some being six feet in height.

Toba Indian

The Tobas wear but little clothes, except when they come into the presence of white people or cross…

Tacca integrifolia or White Bat Plant is a flowering plant cultivated as ornamental plants.

White Bat Plant

Tacca integrifolia or White Bat Plant is a flowering plant cultivated as ornamental plants.

The osseous labyrinth in vertical section. The broken, white lines indicate the position of the basilar membrane of the canal of the cochlea.

Osseous Labyrinth in Vertical Section

The osseous labyrinth in vertical section. The broken, white lines indicate the position of the basilar…

"Male and female catkins of Betula alba." -Lindley, 1853

White Birch

"Male and female catkins of Betula alba." -Lindley, 1853