(London, Harrisn and Sons, 1890). 4to. No wrappers as extracted from "Philosophical Transactions", 1889, Vol. 180 - Series B. Pp. 297-330 and 1 chromolithographed plate. Fine and clean.
First printing of an importent paper in Bateson's scientific career as it deals with central problems in evolutionary theory, the problem of variations. Bateson favours discontinous variations instead of the Darwinian gradual adaptation. Bateson is also famous to for his rediscovery of Mendel's hereditary laws, which he proved holds for animals as well of plants.