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On the basis of the discontinuous variation in several characters which correlate with the disjunct distribution of the two populations, two subspecies of Hyla staufferi are recognized.

Suppose that evolution "in the open" had taken place in the same way, by means of discontinuous variation.

It is a plausible view that the transition from the humanoid to the human was effected by a discontinuous variation of considerable magnitude, what is nowadays called a mutation, and that it had mainly to do with the brain and the vocal organs.

I think I have demolished "discontinuous variation" as having any but the most subordinate part in evolution of species.

The next letter relates to the rising school of biologists who, in opposition to Darwin's views, held that species might arise by what was at the time termed "discontinuous variation."