Animal Life: A First Book of ZoölogyD. Appleton, 1900 - Всего страниц: 329 |
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Стр. vii
... Protozoa , 1. - The animal cell , 2.— What the primitive cell can do , 5. - Amœba , 5. - Paramœcium , 9 . -Vorticella , 12. - Marine Protozoa , 15. - Globigerina and Radio- laria , 16. - Antiquity of the Protozoa , 20. - The primitive ...
... Protozoa , 1. - The animal cell , 2.— What the primitive cell can do , 5. - Amœba , 5. - Paramœcium , 9 . -Vorticella , 12. - Marine Protozoa , 15. - Globigerina and Radio- laria , 16. - Antiquity of the Protozoa , 20. - The primitive ...
Стр. 1
... Protozoa . The simplest ani- mals are those whose bodies are simplest in structure and which do the things done by all living animals , such as eating , breathing , moving , feeling , and reproducing in the most primitive way . The body ...
... Protozoa . The simplest ani- mals are those whose bodies are simplest in structure and which do the things done by all living animals , such as eating , breathing , moving , feeling , and reproducing in the most primitive way . The body ...
Стр. 2
... Protozoa is composed for the animal's whole lifetime of but a single cell . The bodies of all other animals are composed of many cells . The cell may be called the unit of animal ( or plant ) structure . The body of a horse is complexly ...
... Protozoa is composed for the animal's whole lifetime of but a single cell . The bodies of all other animals are composed of many cells . The cell may be called the unit of animal ( or plant ) structure . The body of a horse is complexly ...
Стр. 5
... 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 protozoan , the Amoeba ( Fig . 2 ) . Of all the ...
... 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 protozoan , the Amoeba ( Fig . 2 ) . Of all the ...
Стр. 9
... protozoan which is common . in stagnant pools and can be readily obtained and observed is Paramecium ( Fig . 5 ) . The body of the Paramecium is much larger than that of the Amaba , being nearly one fourth of a millimeter in length ...
... protozoan which is common . in stagnant pools and can be readily obtained and observed is Paramecium ( Fig . 5 ) . The body of the Paramecium is much larger than that of the Amaba , being nearly one fourth of a millimeter in length ...
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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.