The theory of the Aryan race is just an assumption... based on a philological proposition... that a greater number of languages of Europe and some languages of Asia must be referred to a common ancestral speech... (From this) are drawn two inferences: (1) unity of race, and (2) that race being the Aryan race. The argument is that if the languages are descended from a common ancestral speech, then there must have existed a race whose mother tongue it was... From this inference is drawn another inference, which is that of a common original habitat. It is argued that there could be no community of language unless people had a common habitat, permitting close communion.