Experimental Evolution Lectures Delivered in the Summer School of Art And Scie
Experimental Evolution Lectures Delivered in the Summer School of Art And Scie
Henry De Varigny
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Bulbosum, and Rh. Hirsutum, due to the influence of soil containing much silicon, while the latter inhabit soils containing much lime. 220 EXPERIMENTAL EVOLUTION LECT. Some mutilations react on the process of fructifica- tion, if it be true that by cutting through the medulla of a grape-vine stem, grapes are obtained which contain no seeds. The fact has been often spoken of for at least 1, 900 years, as ancient Romans practised it, according to trustworthy witnesses, such as Columella, Camuloge...n, and Pliny. 1 At all events the experiment is worth trying, and some interesting facts might be derived from it. Colour variations may be experimentally deter- mined through changes in environment. Moleschott has observed that in pure oxygen no black pigment is generated in the skin of frogs, and the coloration of birds' eggs sometimes varies with the amount of light to which they are exposed. These facts are enough to point the way to many interesting experiments. We can also produce changes in sexuality, since we know that the want of suitable depositing ground for trout, is, according to Barfurth, followed by degenera- tion and permanent sterility, or at least by the production of weak forms.
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