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Regression.—An important result of quantitative work brings into prominence the steady tendency to maintain the type which appears to be one of the most important results of amphimixis.

Mature ova or spermatozoa will not normally divide if left to themselves, but that is because they are specialised to secure amphimixis, not because their powers are in any way declining or impoverished.

This is the harmony of counterparts and constitutes the best basis of psychic amphimixis.

He attributed variation partly to the union of gametes containing various determinants, which he termed amphimixis: this, however, would introduce nothing new.