"... for identifying the aryo sayana with the vast region that stretches southward from the Hindukus... As a matter of fact, these Avestan texts.. give a fairly uniform picture: eastern Iran, with a certain prevalence of the southern regions or the countries reaching up to the southern slopes of the Hindukus. To make an attempt, as has been done, at reconstructing... the route followed by the Iranian tribes in their migration southwards, or the expansion in the same direction of the Zoroastrian community is, I think, in any case arbitrary from a methodological viewpoint."