Animals: A Text-book of ZoologyD. Appleton, 1905 |
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Стр. 13
... latter kind , called reproduction or multiplication by budding , a small part of the parent body separates , develops a basal circle of cilia , and swims away . The pro- cess of conjugation also takes place among the Vorti- cella , but ...
... latter kind , called reproduction or multiplication by budding , a small part of the parent body separates , develops a basal circle of cilia , and swims away . The pro- cess of conjugation also takes place among the Vorti- cella , but ...
Стр. 51
... latter days of microscopes and mechanical aids to observation it is even easy to see that the smaller animals , the microscopic organ- isms , come into existence only as they are produced by the division of other similar animals , which ...
... latter days of microscopes and mechanical aids to observation it is even easy to see that the smaller animals , the microscopic organ- isms , come into existence only as they are produced by the division of other similar animals , which ...
Стр. 158
... latter , which are distinguished by heads and jaws of great size , act as officers . On the march the small soldiers are arranged in a long , narrow column , while the large soldiers are scattered along on either side of the column and ...
... latter , which are distinguished by heads and jaws of great size , act as officers . On the march the small soldiers are arranged in a long , narrow column , while the large soldiers are scattered along on either side of the column and ...
Стр. 244
... latter may be called the social instincts . In the former class , the instincts of par- enthood , may be included the instincts of courtship , re- production , home - making , nest - building , and care for the young . 131. Feeding ...
... latter may be called the social instincts . In the former class , the instincts of par- enthood , may be included the instincts of courtship , re- production , home - making , nest - building , and care for the young . 131. Feeding ...
Стр. 275
... latter . Both these cases are illustrated among the rats . The black rat , first introduced into America from Europe about 1544 , helped crowd out the native rats , while the brown rat , brought in still later , about 1775 , in turn ...
... latter . Both these cases are illustrated among the rats . The black rat , first introduced into America from Europe about 1544 , helped crowd out the native rats , while the brown rat , brought in still later , about 1775 , in turn ...
Другие издания - Просмотреть все
Animals: A Text-book of Zoology David Starr Jordan,Vernon Lyman Kellogg,Harold Heath Полный просмотр - 1902 |
Animals: A Text-book of Zoology David Starr Jordan,Vernon Lyman Kellogg,Harold Heath Полный просмотр - 1911 |
Часто встречающиеся слова и выражения
adaptation adult alimentary canal Amaba ants become bees beetles birds body wall burrow butterfly called caterpillars cavity chitin CLASS colony color complex animals composed crab crustaceans degeneration digestive egg cells enemies existence external eyes feed female fish flagella free-swimming function gastrula habits hatched host Hydra illus inclosed individuals insects instinct intestine jelly-fishes kinds of animals larva larvæ layer live male mals mammals many-celled animals mass medusæ mouth muscles naturalists nerve nest ocean oesophagus one-celled opening organs outer oxygen Pandorina papillæ Paramecium parasites parent plants polyp possess 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 skin 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. 88 - ... identity of its own. Although in its young stages it may be indistinguishable from some other kind of animal in similar stages, it is sure to come out, when fully developed, an individual of the same kind as its parents were or are. The young fish and the young salamander in the upper row in Fig.
Стр. 164 - Russian naturalist, of the hunting habits of the great white-tailed eagle (Halioetos alMcilla) 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...
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. 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. 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.
Стр. 16 - These animals are the marine Protozoa, those of the " simplest animals " which live in the ocean. Although the water at the surface of the ocean appears clear, and on superficial examination devoid of life, yet a drop of this water taken from certain 'ocean regions examined under the microscope reveals the fact that this water is inhabited by Protozoa. Not only is the water at the very surface of the ocean the home of the simplest animals, but they can be found in all the water from the surface to...
Стр. 216 - The prongs represent the last pair of larval legs which have been greatly modified from their ordinary shape and use. The end of the body is at the same time curved forward over the back (generally much further than in Fig. 112), so that the pink filaments are brandished above the head.
Стр. 253 - Mono had never seen an egg, but his inherited impulses bore a direct relation to feeding on eggs, just as the heredity of Macacus taught the others how to crack nuts or to peel fruit. To each of these monkeys we gave an egg, the first that any of them had ever seen. The baby monkey, Mono, being of an egg-eating race, devoured his egg by the operation of instinct or inherited habit.
Стр. 153 - Finally, a small mass of food is put into the cell, and the cell is 'capped' or covered with wax. Each larva, after eating all its food, in two or three days more changes into a pupa, which lies quiescent without eating for thirteen days, when it changes into a full-grown bee. The new bee breaks open the cap of the cell with its jaws and comes out into the hive, ready to take up its share of the work for the community. "In a few cases, however, the life history is different. The nurses...