The name "Aryan race" must also be frankly discarded as a term of racial significance. It is today purely linguistic, although there was at one time … an identity between the original Aryan mother tongue and the race that first spoke and developed it. In short there is not now, and there never was either a Caucasian or an Indo-European race, but there was once, thousands of years ago, an Aryan race now long since vanished into dim memories of the past.

The Passing of the Great Race (1916)