Written before the era of modern genetic science, it purports to tell the history of the Aryan race, a hypothesized race which, in the late 19th and early 20th centuries, was commonly thought to exist and was regarded as descended from the original speakers of Proto-Indo European.[1] At the time the book was published, the Aryan race was generally regarded as one of three major branches of the Caucasian race, along with the Semitic race and the Hamitic race. This approach to categorizing human population groups is now considered to be misguided and biologically meaningless.[2][3][4]
^Arvidsson 2006:298 Arvidsson, Stefan (2006), Aryan Idols: Indo-European Mythology as Ideology and Science, translated by Sonia Wichmann, Chicago and London: The University of Chicago Press.
^Templeton, A. (2016). "Evolution and Notions of Human Race". In Losos, J.; Lenski, R. (eds.). How Evolution Shapes Our Lives: Essays on Biology and Society. Princeton; Oxford: Princeton University Press. pp. 346–361. doi:10.2307/j.ctv7h0s6j.26. ... the answer to the question whether races exist in humans is clear and unambiguous: no.
^Widney, Joseph PRace Life of the Aryan Peoples New York: Funk & Wagnalls. 1907 in Two Volumes: Volume One--The Old World Volume Two--The New World ISBN B000859S6O