Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: attention to the subtleties of this Neo-Darwinian philosophy. Weismann teaches that " acquired characters," or those variations which first appear in the lifetime of the individual because of the influences of environment, are lost, because they have not yet affected the reproductive substance. But if these characters are induced by the effect of impinging environment during two or more generations, they may come to be so persistent that the plant cannot throw them off, and they become, thereby, a part of the hereditary and non-negotiable property of the species. Now, it is apparent that in one or another of the generations which are thus acted upon by the environment, there must be a beginning towards the fixing or hereditable permanency of the new form, and we might as well assume that this...

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