The original population that the Indo-European Greeks had vanquished when they penetrated the south­ ern Balkan peninsula had, according to Curtius. … - Stefan Arvidsson

With the help of the measurements and speculations of racial anthropology, a “Japhetic,” "Aryan,” or “Indo-European” race was gradually chiseled out. A number of scholars—Joseph Arthur de Gobineau, Friedrich Max Müller, Christian Lassen, Adolphe Pictet, H. S. Chamberlain, Paul Broca, Karl Penka, and Hans F. K. Günther, to name a few —described the Indo-Europeans as blond, blue eyed, tall, with straight (leptorrhine) noses, straight (orthognathous) profiles and long, narrow (dolichocephalic) skulls. Now the Indo-Europeans were no longer a large group of different people who spoke Indo-European languages, but a delineated group of people with defined physical characteris tics. Indians, Persians, Greeks. Romans, Celts, Germans, Slavs, and Balts were now different parts of the same organic whole: the Aryan race. 43

The historian of religions Ulf Drobin clarifies Trubetskoy's point: "all classification must stem from criteria. The followers of the language tree theory avoid definite criteria and replace them with a concept of language that is BOTH changeable (in time) and constant (Indo-European). In the final analysis they end up in paradoxes and mysticism. Ur-Indo-European must either lack prehistory, or it must have a non-Indo-European prehistory. The latter, however, cannot be explained with out some form of criteria" (Arvidsson 2006, p.297, emphasis and parentheses in the original).

For those who have approached the question of the origin of the Indo-European peoples and languages from the angle of philology, the great problem has been that there are no texts about migrations, much less about military invasions… From the Rigveda, people have taken passages that tell about the Aryans' attacks on cities and concluded that they then must have been a foreign, warlike, nomadic people. Nor does Roman, Hittite, Slavic, Celtic, or Germanic, written material mention migrations or conquests from the time when the Indo-Europeans supposedly emigrated from their original home. The philologists have, however, been able to pint to certain loanwords, especially topographic and hydrographic names, as evidence of migration. But the cornerstone of philologists' work has been linguistic paleontology, which tried to re-create, through comparisons, a vocabulary that indicates knowledge about certain objects and phenomena (Arvidsson 2006, p.295).