Animal Life: A First Book of ZoölogyD. Appleton, 1900 - Всего страниц: 329 |
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Стр. 7
... true that the Amaba takes into its body through any part of its surface oxygen from the air which is mixed with water , and it gives off from any part of its body carbonic - acid gas . Although the Amaba has no lungs or gills or other ...
... true that the Amaba takes into its body through any part of its surface oxygen from the air which is mixed with water , and it gives off from any part of its body carbonic - acid gas . Although the Amaba has no lungs or gills or other ...
Стр. 15
... true fishes ; and the jelly - fishes and corals and star - fishes which abound along the ocean's edge . But in naming only these we should be omitting certain animals which in point of abundance of individuals vastly outnumber all other ...
... true fishes ; and the jelly - fishes and corals and star - fishes which abound along the ocean's edge . But in naming only these we should be omitting certain animals which in point of abundance of individuals vastly outnumber all other ...
Стр. 43
... true polyp form , never producing medusæ . Others have w only the medusa form . Some live in colonies , and others are always solitary . The animals we know as corals are polyps which live in enormous colonies , and which exist only in ...
... true polyp form , never producing medusæ . Others have w only the medusa form . Some live in colonies , and others are always solitary . The animals we know as corals are polyps which live in enormous colonies , and which exist only in ...
Стр. 45
... true fixed polyp , many of the larger and more beautiful jelly - fishes do not exist in any other form . Some of these larger jelly- fishes are several feet in diameter , and when cast up on the beach form a great shapeless mass of soft ...
... true fixed polyp , many of the larger and more beautiful jelly - fishes do not exist in any other form . Some of these larger jelly- fishes are several feet in diameter , and when cast up on the beach form a great shapeless mass of soft ...
Стр. 52
... true of the animalcules of stagnant water . If some water in which there are apparently no living organisms , however minute , be allowed to stand for a few days , it will come to be swarming with microscopic plants and animals . Any or ...
... true of the animalcules of stagnant water . If some water in which there are apparently no living organisms , however minute , be allowed to stand for a few days , it will come to be swarming with microscopic plants and animals . Any or ...
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adaptation adult alimentary canal Amaba ants become bees birds butterfly called cavity chitin CLASS colony color complex animals composed conjugation coral crab crustaceans degeneration differentiation digestion divide ectoderm egg cells existence eyes fauna feed female fish flagella free-swimming function gastrula Globigerinæ habits hatched higher animals host Hydra inclosed increase individuals insects instinct intestine islands jelly-fishes kinds of animals larva larvæ layer live male mals mammals many-celled animals mass medusa mouth opening naturalists nerve nest nucleus ocean one-celled outer oxygen Pandorina papillæ Paramecium parasites parent perform plants polyp prey primitive processes produced protective resemblance protoplasm Protozoa pseudopods pupa queen Radiolaria reflex action reproductive cells Sacculina sea-anemone shape shell simple simplest animals single cell special sense species sperm cells spherical spiders sponge stage structure substance surface swimming tentacles tion vertebrates Volvox Vorticella wings workers worms young
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Стр. 115 - There is no exception to the rule that every organic being naturally increases at so high a rate, that, if not destroyed, the earth would soon be covered by the progeny of a single pair. Even slow-breeding man has doubled in twenty-five years, and at this rate, in less than a thousand years, there would literally not be standing room for his progeny.
Стр. 215 - He cannot be mistaken for any other, and his flaming vest and blue stockings show that he does not court concealment. He is very abundant in the damp woods, and I was convinced he was uneatable so soon as I made his acquaintance and saw the happy sense of security with which he hopped about. I took a few specimens home with me, and tried my fowls and ducks with them ; but none would touch them. At last, by throwing down pieces of meat, for which there was a great competition amongst them, I managed...
Стр. 20 - ... inhabitants of the water has followed a roundabout path from the surface to the bottom and then back into the water. When this fact is seen in all its bearings and its full significance is grasped, it is certainly one of the most notable and instructive features of evolution. The food-supply of marine animals consists of a few species of microscopic organisms which are inexhaustible and the only source of food for all the inhabitants of the ocean.
Стр. 116 - The elephant is reckoned the slowest breeder of all known animals, and I have taken some pains to estimate its probable minimum rate of natural increase; it will be safest to assume that it begins breeding when thirty years old, and goes on breeding till ninety years old, bringing forth six young in the interval, and surviving till one hundred years old ; if this be so, after a period of from 740 to 750 years there would be nearly nineteen million elephants alive, descended from the first pair.