As for what constitutes a racially pure German, no one knows, whatever your Reichsführer-SS may say. So racial anthropology, incapable of defining anything, was simply built on the so much more demonstrable categories of linguistics. Schlegel, who was fascinated by the work of Humboldt and Bopp, deduced from the existence of a supposedly original Indo-Iranian language the idea of an equally original people, whom he baptized Aryan, taking the term from Herodotus. The same for the Jews: once the linguists had demonstrated the existence of a so-called Semitic group of languages, the racialists
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