The Evolution Theory volume 1

Cover The Evolution Theory volume 1
The Evolution Theory volume 1
Weismann, August, 1834-1914
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Among plants there is very widely distributed mutual fertility between species. I doubt, however, whether the observations on this point are sufficient to warrant any certain conclusion in regard to the importance of the phenomena in the formation of species. At least it is not easy to see why the mutual sterility of many species of plants should not have been necessary or useful in separating species, and why it was not therefore evolved. We may point to the fact that animals can move from pla
...ce to place as the chief reason, and this factor does undoubtedly play a part, but the widespread crossing of plants by insects makes up to some extent, as far as sexual intermingling is concerned, for their inability to move from place to place. I do not know whether the species of orchid which are fertile with one another belong to different countries, so that we may assume that they originated in isolation, or whether fertile orchids from the same area are fertilized by different insects and are thus sexually isolated.

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