Animal Life: A First Book of ZoölogyD. Appleton, 1900 - 329 páginas |
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Página vii
... reproductive cells , 55 . -Sex , or male and female , 57. - The object of sex , 57. - Sex di- morphism , 58. - The number of young , 61 . IV . - FUNCTION AND STRUCTURE Organs and functions , 63. - Differentiation of structure , 64 ...
... reproductive cells , 55 . -Sex , or male and female , 57. - The object of sex , 57. - Sex di- morphism , 58. - The number of young , 61 . IV . - FUNCTION AND STRUCTURE Organs and functions , 63. - Differentiation of structure , 64 ...
Página 28
... reproductive cells . from the envelope of the parent cell , remaining for some time united in small bundles . Other cells of the colony do not divide , but increase slightly in size and become spherical in shape . When a bundle of the small ...
... reproductive cells . from the envelope of the parent cell , remaining for some time united in small bundles . Other cells of the colony do not divide , but increase slightly in size and become spherical in shape . When a bundle of the small ...
Página 29
... cells , arranged in a single peripheral layer about the hollow center of the ball . The cells are ovoid , and each ... reproductive cells of Volvox globator . FIG . 21. - A polyp , or sea -. THE LIFE OF THE SLIGHTLY COMPLEX ANIMALS 29.
... cells , arranged in a single peripheral layer about the hollow center of the ball . The cells are ovoid , and each ... reproductive cells of Volvox globator . FIG . 21. - A polyp , or sea -. THE LIFE OF THE SLIGHTLY COMPLEX ANIMALS 29.
Página 30
... cells , each of which is provided with flagella . The remaining cells of the colony ( that is , those which have not ... reproductive cells . They continue to waft the great colony through the water by lashing their flagella ; they ...
... cells , each of which is provided with flagella . The remaining cells of the colony ( that is , those which have not ... reproductive cells . They continue to waft the great colony through the water by lashing their flagella ; they ...
Página 31
... reproductive cells . The egg cells are compara- tively enormous , and they are stored with a mass of food material . The fertilizing cells are very small , but very active and very different from the egg cells . We have in Volvox the ...
... reproductive cells . The egg cells are compara- tively enormous , and they are stored with a mass of food material . The fertilizing cells are very small , but very active and very different from the egg cells . We have in Volvox the ...
Outras edições - Ver tudo
Animal Life: A First Book of Zoölogy David Starr Jordan,Vernon Lyman Kellogg Visualização integral - 1900 |
Animal Life: A First Book of Zoölogy David Starr Jordan,Vernon Lyman Kellogg Visualização integral - 1912 |
Animal Life: A First Book of Zoölogy David Starr Jordan,Vernon Lyman Kellogg Visualização integral - 1900 |
Palavras e frases frequentes
adaptation alimentary canal Amaba ants auditory barriers become bees birds body butterfly California called caterpillars cavity chitinous CLASS colony color common complex animals composed conjugation crab crustaceans differentiation digestive divide division ectoderm egg cells eyes fauna feed female fishes flagella free-swimming function habits hatched higher animals Hydra inclosed individuals insects instinct islands jelly-fishes kinds of animals larva larvæ layer live lower male mals mammals many-celled animals mass medusæ mimicry Monarch butterfly moth naturalists nerve nest nucleus ocean one-celled outer Pandorina papillæ Paramecium parasites parent plants polyp possess prey primitive processes produced protective resemblance protoplasm Protozoa pseudopods Radiolaria realm reflex action region reproductive cells River Sacculina simple simplest animals single cell smell special senses species sperm cells spherical spiders sponge stage streams structure substance surface swim tentacles tion trout vertebrates Volvox Vorticella wall wings worms young
Passagens conhecidas
Página 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.
Página 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.
Página 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...
Página 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...