Animal Life: A First Book of ZoölogyD. Appleton, 1900 - Всего страниц: 329 |
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Стр. 1
... perform the various kinds of work for which they are fitted in a complex way . The simplest animals are all very small , and almost all live in the water ; some kinds in fresh water and many kinds in the ocean . Some live in damp sand ...
... perform the various kinds of work for which they are fitted in a complex way . The simplest animals are all very small , and almost all live in the water ; some kinds in fresh water and many kinds in the ocean . Some live in damp sand ...
Стр. 4
... performing the processes of life depends . Protoplasm is the primitive basic life substance , but it is the presence of these complex albuminous compounds that makes protoplasm the life substance . A student of protoplasm and the funda ...
... performing the processes of life depends . Protoplasm is the primitive basic life substance , but it is the presence of these complex albuminous compounds that makes protoplasm the life substance . A student of protoplasm and the funda ...
Стр. 5
... performs all the processes necessary for the life of an animal . The single cell , the single minute speck of protoplasm , has the power of doing , in a very simple and primitive way , all those things which are necessary for life , and ...
... performs all the processes necessary for the life of an animal . The single cell , the single minute speck of protoplasm , has the power of doing , in a very simple and primitive way , all those things which are necessary for life , and ...
Стр. 9
... performing these functions , and the young are simply two parts of the parent's body . But if there be any doubt about the matter , observation of the behavior of the young or new Amaba will soon remove it . Each puts out pseudopods ...
... performing these functions , and the young are simply two parts of the parent's body . But if there be any doubt about the matter , observation of the behavior of the young or new Amaba will soon remove it . Each puts out pseudopods ...
Стр. 13
... performed , and the body is like the body of the Amaba , a single cell . Vorticella is plainly one of " the simplest animals . " 7. Gregarina . — A fourth kind of protozoan to which we can profitably give some special attention is ...
... performed , and the body is like the body of the Amaba , a single cell . Vorticella is plainly one of " the simplest animals . " 7. Gregarina . — A fourth kind of protozoan to which we can profitably give some special attention is ...
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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.