Animal Life: A First Book of ZoölogyD. Appleton, 1900 - 329 pages |
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adaptation adult alimentary canal Amaba ants become bees beetles birds butterfly called cavity chitin CLASS colony color complex animals composed conjugation crab crustaceans degeneration differentiation digestive divide division ectoderm egg cells embryo existence eyes fauna feed female fish flagella free-swimming function gastrula habits hatched higher animals host Hydra inclosed increase individuals insects instinct intestine jelly-fishes kinds of animals larva larvæ layer live male mals mammals many-celled animals mass medusæ metamorphosis mouth naturalists nerve nest nucleus ocean one-celled opening organs outer oxygen Pandorina papillæ Paramecium parasites parent plants polyp prey primitive processes produced protective resemblance protoplasm Protozoa pseudopods pupa Radiolaria reflex action reproductive cells Sacculina sea-anemone shell simple simplest animals single cell special sense species sperm cells spherical spiders sponge stage structure substance surface swimming tentacles tion tissues vertebrates Volvox Vorticella wings workers worms young
Popular passages
Page 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.
Page 88 - Fig. 145 are indistinguishably alike, but one embryo is sure to develop into a fish and the other into a salamander. This certainty of an embryo to become an individual of a certain kind is called the law of heredity.
Page 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...
Page 164 - Russian naturalist, of the hunting habits of the great white-tailed eagle (Haliattos albicilla) on the Russian steppes shows that this kind of eagle at least has adopted a gregarious habit, in which mutual help is plainly obvious. This naturalist once saw an eagle high in the air, circling slowly and widely in perfect silence. Suddenly the eagle screamed loudly. " Its cry was soon answered by another eagle, which approached it, and was followed by a third, a fourth, and so on, till nine or ten eagles...