Half Hours With the Lower Animals, Protozoans, Sponges, Corals, Shells, Insects, And Crustaceans
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In our eReader you can find the full English version of the book. Read Half Hours With the Lower Animals, Protozoans, Sponges, Corals, Shells, Insects, And Crustaceans Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Half Hours With the Lower Animals, Protozoans, Sponges, Corals, Shells, Insects, And Crustaceans
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The rotifers assume a variety of shapes. One is a typical worm, another darts along by the aid of two circlets of cilia which vibrate so rapidly that the illusion of rolling is produced. No more wonderful crea- tures than these little worms are known, and they well repay the study required to know them well. Some of them are fixed and unable to swim, and many of the stories of spontaneous generation are due to the faculty these Fig. 66. — Polyzoans ; i, colony in plant form ; .i, 3, cells of th...e worms magnified.
minute rotifers (often but three one hundredths of an inch in length) have of enduring almost any amount of drying.
Thus if a pond is dried up by the sun, the rotifers seem to be able to lie dormant for a long time, and when a rain falls in the locality for the first time in years, the pool is at once peopled with rotifers which awaken from their long sleep. When it is known that Ehrenberg, the German naturalist, found that a certain species produced sixteen million young in less than two weeks, it is easy to under 78 THE WORMS stand how quickly a new pond might become rapidly equipped with a large population.
What to read after Half Hours With the Lower Animals, Protozoans, Sponges, Corals, Shells, Insects, And Crustaceans?
You can find similar books in the "Read Also" column, or choose other free books by Charles Frederick Holder to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The rotifers assume a variety of shapes. One is a typical worm, another darts along by the aid of two circlets of cilia which vibrate so rapidly that the illusion of rolling is produced. No more wonderful crea- tures than these little worms are known, and they well repay the study required to know them well. Some of them are fixed and unable to swim, and many of the stories of spontaneous generation are due to the faculty these Fig. 66. — Polyzoans ; i, colony in plant form ; .i, 3, cells of th...e worms magnified.
minute rotifers (often but three one hundredths of an inch in length) have of enduring almost any amount of drying.
Thus if a pond is dried up by the sun, the rotifers seem to be able to lie dormant for a long time, and when a rain falls in the locality for the first time in years, the pool is at once peopled with rotifers which awaken from their long sleep. When it is known that Ehrenberg, the German naturalist, found that a certain species produced sixteen million young in less than two weeks, it is easy to under 78 THE WORMS stand how quickly a new pond might become rapidly equipped with a large population.
What to read after Half Hours With the Lower Animals, Protozoans, Sponges, Corals, Shells, Insects, And Crustaceans?
You can find similar books in the "Read Also" column, or choose other free books by Charles Frederick Holder to read onlineMoreLess
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