XXVII.

A multiplicity of protoplasts for a single species is a contradiction in terms. If two or more such individuals (or pairs), as like as the two _Dromios_, were the several protoplasts to several classes of organised beings (the present members being as like each other as their first ancestors were), the phænomenon would be the existence in Nature of more than one undistinguishable species, not the existence of more than one protoplast to a single species.

A _variety_ is a class of individuals, each belonging to the same species, but each differing from other individuals of the species in points wherein they agree amongst each other.