Animal Life: A First Book of ZoölogyD. Appleton, 1900 - 329 páginas |
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Página 5
... Amoeba . The simple and primitive life of these Protozoa can be best understood by the observation of living individuals . In the slime and sediment at the bottom of stagnant pools lives a certain specially interest- ing kind of ...
... Amoeba . The simple and primitive life of these Protozoa can be best understood by the observation of living individuals . In the slime and sediment at the bottom of stagnant pools lives a certain specially interest- ing kind of ...
Página 6
... Amoeba moves . There are no muscles in this tiny body ; muscles are composed of many contractile cells massed together , and the Amoeba is but one cell . But it is a contractile cell ; it can do what the muscles of the com- plex animals ...
... Amoeba moves . There are no muscles in this tiny body ; muscles are composed of many contractile cells massed together , and the Amoeba is but one cell . But it is a contractile cell ; it can do what the muscles of the com- plex animals ...
Página 7
... Amoeba breathes . Though we can not readily ob- serve this act of respiration , it is true that the Amaba takes into its body through any part of its surface oxygen from the air which is mixed with water , and it gives off from any part ...
... Amoeba breathes . Though we can not readily ob- serve this act of respiration , it is true that the Amaba takes into its body through any part of its surface oxygen from the air which is mixed with water , and it gives off from any part ...
Página 9
... Amoeba is the parent ; the two halves of the parent are the young . Each of the young possesses all of the characteristics and powers of the parent ; each can move , eat , feel , grow , and reproduce by fission . It is very evident that ...
... Amoeba is the parent ; the two halves of the parent are the young . Each of the young possesses all of the characteristics and powers of the parent ; each can move , eat , feel , grow , and reproduce by fission . It is very evident that ...
Página 10
... Amoeba does . Both nuclei divide first , and then the cytoplasm constricts and divides ( Fig . 6 ) . Thus two new Paramacia are formed . One of them has to de- velop a new mouth opening and groove , so that there is in FIG . 5 ...
... Amoeba does . Both nuclei divide first , and then the cytoplasm constricts and divides ( Fig . 6 ) . Thus two new Paramacia are formed . One of them has to de- velop a new mouth opening and groove , so that there is in FIG . 5 ...
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...