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Updated: June 11, 2025
Intercrosses, also, with the individuals of the same species, which otherwise would have inhabited the surrounding and differently circumstanced districts, will be prevented.
Natural Selection its power compared with man's selection its power on characters of trifling importance its power at all ages and on both sexes Sexual Selection On the generality of intercrosses between individuals of the same species Circumstances favourable and unfavourable to the results of Natural Selection, namely, intercrossing, isolation, number of individuals Slow action Extinction caused by Natural Selection Divergence of Character, related to the diversity of inhabitants of any small area and to naturalisation Action of Natural Selection, through Divergence of Character and Extinction, on the descendants from a common parent Explains the Grouping of all organic beings Advance in organisation Low forms preserved Convergence of character Indefinite multiplication of species Summary.
It intercrosses wool and goat's hair so as to form two courses which are afterwards united to each other below, and constitute the first sketch of the nest, at this moment like a flat-bottomed basket. This is only the beginning. The whole wall is reinforced by the addition of new material.
Intercrossing plays a very important part in nature in keeping the individuals of the same species, or of the same variety, true and uniform in character. It will obviously thus act far more efficiently with those animals which unite for each birth; but I have already attempted to show that we have reason to believe that occasional intercrosses take place with all animals and with all plants.
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