Principles of Zoölogy: Pt.I Comparative Physiology
Principles of Zoölogy: Pt.I Comparative Physiology
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In our eReader you can find the full English version of the book. Read Principles of Zoölogy: Pt.I Comparative Physiology 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 Principles of Zoölogy: Pt.I Comparative Physiology
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To quickly assess the difficulty of the text, read a short excerpt:
The development of the embryo does not always take place immediately aAer the egg is laid. A considera- ble time, even, may elapse before it commences. Thus, the first eggs laid by the hen do not begin to develop untU the whole number which is to constitute the brood is deposited.
The eggs of most butterflies, and of insects in general, are laid in autumn, in temperate climates, and remain unchanged until the followmg spring. During this time, the principle of life in the egg is not extinct, bu...t is simply inactive, or in a latent state. This tenacity of life is displayed in a still more striking manner in plants. The seeds, which are equivalent to eggs, preserve for years, and even for ag^, their power to germinate. Thus, there are some well- authenticated cases in which wheat taken from the ancient catacombs of Egypt has been made to sprout and grow.
285. A certain degree of warmth is requisite for the hatching of eggs. Those of birds, especially, require to be submitted, for a certain length of time, to a uniform tem- perature, corresponding to the natural heat of the future chicken, which is naturally supplied by the body of the parent.
What to read after Principles of Zoölogy: Pt.I Comparative Physiology?
You can find similar books in the "Read Also" column, or choose other free books by Louis Agassiz to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The development of the embryo does not always take place immediately aAer the egg is laid. A considera- ble time, even, may elapse before it commences. Thus, the first eggs laid by the hen do not begin to develop untU the whole number which is to constitute the brood is deposited.
The eggs of most butterflies, and of insects in general, are laid in autumn, in temperate climates, and remain unchanged until the followmg spring. During this time, the principle of life in the egg is not extinct, bu...t is simply inactive, or in a latent state. This tenacity of life is displayed in a still more striking manner in plants. The seeds, which are equivalent to eggs, preserve for years, and even for ag^, their power to germinate. Thus, there are some well- authenticated cases in which wheat taken from the ancient catacombs of Egypt has been made to sprout and grow.
285. A certain degree of warmth is requisite for the hatching of eggs. Those of birds, especially, require to be submitted, for a certain length of time, to a uniform tem- perature, corresponding to the natural heat of the future chicken, which is naturally supplied by the body of the parent.
What to read after Principles of Zoölogy: Pt.I Comparative Physiology?
You can find similar books in the "Read Also" column, or choose other free books by Louis Agassiz to read onlineMoreLess
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