Note 528 — Chapter XI

See an ingenious article entitled, “Difficulties of the Theory of Natural Selection,” in the ‘Month,’ 1869. The writer strangely supposes that I attribute the variations in colour of the Lepidoptera, by which certain species belonging to distinct families have come to resemble others, to reversion to a common progenitor; but there is no more reason to attribute these variations to reversion than in the case of any ordinary variation.