Principles of Breeding; a Treatise On Thremmatology Or the Principles And Practices Involved in the Economic Improvement of Domesticated Animals And Plants
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In our eReader you can find the full English version of the book. Read Principles of Breeding; a Treatise On Thremmatology Or the Principles And Practices Involved in the Economic Improvement of Domesticated Animals And Plants 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 Breeding; a Treatise On Thremmatology Or the Principles And Practices Involved in the Economic Improvement of Domesticated Animals And Plants
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To quickly assess the difficulty of the text, read a short excerpt:
Davenport, Experimental Morphology, Part II, pp. 437-445.
250 CAUSES OF VARIATION In the very highest animals little but the eye is sensitive to light, most parts being protected by a heavy epidermis or other covering, so that heliotropism in its strictest sense is in them limited to the visual parts. In lower animals, however, with bodies less protected, light exerts a controlling influence upon movements.
Influence of light upon the direction of locomotion.^ It has already been explained that... some animals exhibit heliotropism only at certain periods of their lives, or only in certain condi- tions, as when hungry. Others, however, are constantly and uniformly sensitive. The common house fly is positively helio- tropic, while the larvae of the same, hatched in the dark, soon become strongly negative, and so continue while in the larval condition.^ This difference between the larval and adult stage is common, and led Loeb at first to suppose it to be a general principle, — a conclusion invalidated by the fact that caterpillars and their imagoes behave alike.
What to read after Principles of Breeding; a Treatise On Thremmatology Or the Principles And Practices Involved in the Economic Improvement of Domesticated Animals And Plants?
You can find similar books in the "Read Also" column, or choose other free books by E Eugene Davenport to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Davenport, Experimental Morphology, Part II, pp. 437-445.
250 CAUSES OF VARIATION In the very highest animals little but the eye is sensitive to light, most parts being protected by a heavy epidermis or other covering, so that heliotropism in its strictest sense is in them limited to the visual parts. In lower animals, however, with bodies less protected, light exerts a controlling influence upon movements.
Influence of light upon the direction of locomotion.^ It has already been explained that... some animals exhibit heliotropism only at certain periods of their lives, or only in certain condi- tions, as when hungry. Others, however, are constantly and uniformly sensitive. The common house fly is positively helio- tropic, while the larvae of the same, hatched in the dark, soon become strongly negative, and so continue while in the larval condition.^ This difference between the larval and adult stage is common, and led Loeb at first to suppose it to be a general principle, — a conclusion invalidated by the fact that caterpillars and their imagoes behave alike.
What to read after Principles of Breeding; a Treatise On Thremmatology Or the Principles And Practices Involved in the Economic Improvement of Domesticated Animals And Plants?
You can find similar books in the "Read Also" column, or choose other free books by E Eugene Davenport to read onlineMoreLess
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