In Grant's view, Nordics probably evolved in a climate which "must have been such as to impose a rigid elimination of defectives through the agency of hard winters and the necessity of industry and foresight in providing the year's food, clothing, and shelter during the short summer. Such demands on energy, if long continued, would produce a strong, virile, and self-contained race which would inevitably overwhelm in battle nations whose weaker elements had not been purged by the conditions of an equally severe environment" (p. 170). The "Proto-Nordic" human, Grant reasoned, probably evolved in "forests and plains of eastern Germany, Poland and Russia" (p. 170).