But, in considering an Eastern European nation, such misgivings of anthropogeographical science cannot be justified. Just as the physico-geographic conditions of Western and Central Europe are measured by other standards than those of Eastern Europe, so the anthropogeographical problems of this region, too, must be approached differently. Just as the physico-geographical variety of Western and Central Europe gives way to Eastern European uniformity in Ukrainian territory, so the anthropological variety gives place to greater unity. Vast areas of the Ukraine, even without any great natural hindrance, were always unfavorable to separation into classes, and did not encourage the development of physical differences. And foreign admixtures are almost out of the question. For the foreign peoples which, since the earliest beginnings of history, traversed or even dominated the region of the Ukraine, were first of all too small in number to make any noticeable impression on the anthropological type of the Ukrainians. And, besides that, the foreign races—almost all nomad peoples—came into the land as fierce enemies, with whom there existed no voluntary peaceful relations. For these reasons the Ukrainian nation reveals a much greater uniformity in its anthropological aspect than the nations of Western and Central Europe, [161]which, in the course of history, were visited by innumerable peoples of the most varied anthropological types, who stayed there and were assimilated. If, therefore, in these peoples, anthropological characteristics can have no particular significance, the matter is quite different with the Ukrainians and many other Eastern European nations. Here, anthropological peculiarities still have considerable weight as distinguishing characteristics of nations. Investigations concerning the anthropology of the Ukrainians began more than half a century ago. But they were made, without any system, in different regions of the great national territory selected, quite without a plan, and for a long time gave no acceptable results. Not until the 20th Century was enough material gathered to at least make it possible to determine the main anthropological type of the Ukrainians. The most important investigators in this field are: Hopernitsky, Protzenko, Welker, Popov, Hilchenko, Krasnov, Petrov, Erckert, Emme, Talko Hrincewich, Diebold, Biloyid, Anuchin, Ivanovsky, Vovk and Rakovsky.