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Updated: May 14, 2025
Powers were limited through this multiplicity and inter-crossing of authorities.
From this we can infer, that in the crossing of varieties, no unpaired remainder is left, all units combining in pairs exactly as in ordinary fertilization. Setting aside the contrast between activity and latency in this single pair, the procedure in the inter-crossing of varieties is the same as in ordinary normal fertilization.
By inter-crossing they maintain a common line of progress, one individual never being able to proceed much ahead of the others. The birth of the new species necessarily seemed to involve the death of the old one. This last conclusion, however, is hard to understand.
Summarizing this discussion we may conclude that in normal fertilization and in the inter-crossing of varieties all characters are paired, while in crosses between elementary species the differentiating marks are not mated. In order to distinguish these two great types of fertilization we will use the term bisexual for the one and unisexual for the other.
Natural selection is continually being neutralised by subsequent inter-crossing and reversion. Natural selection may indeed prevent degeneration within the limits of the species by weeding out what is weak and bad, but it is powerless beyond these limits, and so forth. These ever-repeated and ever-increasing objections are purely critical.
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