Animal Life: A First Book of ZoölogyD. Appleton, 1900 - Всего страниц: 329 |
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Стр. 6
... close watching it may be seen that the Amaba changes its position on the glass slip . Although provided with no legs or wings or FIG . 2. - An Amaba , showing different shapes assumed by it when crawling . -After VERWORN . scales or ...
... close watching it may be seen that the Amaba changes its position on the glass slip . Although provided with no legs or wings or FIG . 2. - An Amaba , showing different shapes assumed by it when crawling . -After VERWORN . scales or ...
Стр. 13
... close spiral . In the body mass there is one pulsating vacuole and one nucleus . Usually many Vorticelle are found together on a common stalk , thus forming a proto- zoan colony . The life processes of Vorticella are of the simple kind ...
... close spiral . In the body mass there is one pulsating vacuole and one nucleus . Usually many Vorticelle are found together on a common stalk , thus forming a proto- zoan colony . The life processes of Vorticella are of the simple kind ...
Стр. 32
... close group or colony , and they may be so attached to each other as to appear like a branching plant . This branching may be very diffuse , and the branches . may become so interwoven with each other as to form 32 ANIMAL LIFE.
... close group or colony , and they may be so attached to each other as to appear like a branching plant . This branching may be very diffuse , and the branches . may become so interwoven with each other as to form 32 ANIMAL LIFE.
Стр. 45
... close massing form great reefs or banks and islands . Coral islands occur only in the warmer oceans . In the Atlantic they are found along the coasts of southern Florida , Brazil , and the West Indies ; in the Pacific and Indian Oceans ...
... close massing form great reefs or banks and islands . Coral islands occur only in the warmer oceans . In the Atlantic they are found along the coasts of southern Florida , Brazil , and the West Indies ; in the Pacific and Indian Oceans ...
Стр. 46
... close , and by thus drawing in and expelling water from their cavities impel the whole colony through the water . These bell - shaped structures are attached me- are very sensitive , and the polyps bearing them have 46 ANIMAL LIFE.
... close , and by thus drawing in and expelling water from their cavities impel the whole colony through the water . These bell - shaped structures are attached me- are very sensitive , and the polyps bearing them have 46 ANIMAL LIFE.
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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.