Animal Life: A First Book of ZoölogyD. Appleton, 1900 - 329 páginas |
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Página 3
... inclosed by a cell wall which may be simply a tougher outer layer of the cytoplasm , or may be a thin membrane secreted by the pro- toplasm . In addition to the proto- plasm , which is the fundamental and essential cell substance , the ...
... inclosed by a cell wall which may be simply a tougher outer layer of the cytoplasm , or may be a thin membrane secreted by the pro- toplasm . In addition to the proto- plasm , which is the fundamental and essential cell substance , the ...
Página 7
... inclosed in it ( Fig . 3 ) . The absorbed particle soon wholly or partly disappears . This is the manner in which the Amaba eats . It has no mouth or 0 stomach . Any part of its body mass can take in and digest food . The viscous ...
... inclosed in it ( Fig . 3 ) . The absorbed particle soon wholly or partly disappears . This is the manner in which the Amaba eats . It has no mouth or 0 stomach . Any part of its body mass can take in and digest food . The viscous ...
Página 15
... inclosed in a tough , membranous coat . This may in turn be covered externally by a jelly - like substance . The nucleus and the protoplasm of the body inside of the coat now divide into many small parts called spores , each spore ...
... inclosed in a tough , membranous coat . This may in turn be covered externally by a jelly - like substance . The nucleus and the protoplasm of the body inside of the coat now divide into many small parts called spores , each spore ...
Página 34
... process of conjugation and subsequent division . In its simplest way multiplication takes place by a group of cells separating from the body of the parent sponge , becoming inclosed in a common capsular envelope , and by. 34 ANIMAL LIFE.
... process of conjugation and subsequent division . In its simplest way multiplication takes place by a group of cells separating from the body of the parent sponge , becoming inclosed in a common capsular envelope , and by. 34 ANIMAL LIFE.
Página 35
A First Book of Zoölogy David Starr Jordan, Vernon Lyman Kellogg. becoming inclosed in a common capsular envelope , and by repeated division and consequent increase in number of cells becoming a new sponge . This is reproduction by ...
A First Book of Zoölogy David Starr Jordan, Vernon Lyman Kellogg. becoming inclosed in a common capsular envelope , and by repeated division and consequent increase in number of cells becoming a new sponge . This is reproduction by ...
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...