What shall we say of the European races, the third of our intermediate types? Here also all individual variations occur, seemingly in utter defiance of any law. The Italian is as apt to be straight-haired as the Norwegian; in either nation the curly variety seems to occur sporadically. Yet common observation, to say nothing of microscopical examination, would naturally class the population of Europe among the fine-textured, wavy-haired races of the earth. One never sees the wiry form so familiar in the American Indian, or the frizzle of the full-blooded negro.
William Z. Ripley. "The Racial Geography of Europe. XII.—The Aryan Question". Popular Science Monthly, Vol 52, Jan 1898.