The recessive nature of albinism and its distribution in Mendelian fashion is almost certainly as true for man as for lower forms. This has been shown by W.
From all of this, he developed the idea of dominant and recessive genes (although they weren't yet called that) and the mechanism for how traits are inherited.
In heredity, complete albinism among animals is always recessive; and partial albinism (piebald) is always recessive to complete pigmentation (self-coloured).
If we assume that the two negresses which the third son married were themselves carrying albinism recessive - an exceedingly probable condition considering that albino negroes are not uncommon - the result is accurately in accordance, as W.