Animal Life: A First Book of ZoölogyD. Appleton, 1900 - Всего страниц: 329 |
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Стр. 83
... adult worker ; b , young or larval worker . so that when the young animal hatches there is necessary little more than a rapid growth and increase of size to make it a fully developed , mature animal . This is the case with the birds : a ...
... adult worker ; b , young or larval worker . so that when the young animal hatches there is necessary little more than a rapid growth and increase of size to make it a fully developed , mature animal . This is the case with the birds : a ...
Стр. 84
... adult animal . Development is from the general to the special , as was said years ago by the first great student of development . 53. Divergence of development . - A star - fish , a beetle , a dove , and a horse are all alike in their ...
... adult animal . Development is from the general to the special , as was said years ago by the first great student of development . 53. Divergence of development . - A star - fish , a beetle , a dove , and a horse are all alike in their ...
Стр. 86
... — That the course of development of any animal from its beginning to fully developed adult form is fixed and certain is readily seen . Every rabbit develops in the same way ; every grass- I I 1999 II H II II Hasa III III 86 ANIMAL LIFE.
... — That the course of development of any animal from its beginning to fully developed adult form is fixed and certain is readily seen . Every rabbit develops in the same way ; every grass- I I 1999 II H II II Hasa III III 86 ANIMAL LIFE.
Стр. 91
... adult , and that is in its lack of wings . The adult grasshopper has two pairs of wings ; the just hatched young or larval grasshopper has no wings at all . The young grasshopper feeds voraciously and grows rapidly . FIG . 42. - Post ...
... adult , and that is in its lack of wings . The adult grasshopper has two pairs of wings ; the just hatched young or larval grasshopper has no wings at all . The young grasshopper feeds voraciously and grows rapidly . FIG . 42. - Post ...
Стр. 92
... adult . For example of complete metamorphosis among insects we may choose a butterfly , the large red - brown butterfly b a TAY C MW : FIG . 43. - Metamorphosis of monarch butterfly ( Anosia plexippus ) . a , egg ; b , larva ; c , pupa ...
... adult . For example of complete metamorphosis among insects we may choose a butterfly , the large red - brown butterfly b a TAY C MW : FIG . 43. - Metamorphosis of monarch butterfly ( Anosia plexippus ) . a , egg ; b , larva ; c , pupa ...
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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.