Henry Fairfield Osborn, Men of the Old Stone Age: Their Environment…
“ Disappearance of the Neanderthal RaceWe have seen that the Neanderthals dwelt in Europe for a very long time, many thousands of years, during which they doubtless underwent considerable evolution from lower to higher types, and into varieties, under the modifying influences of climate, food, and racial habits. Consequently the known remains of Neanderthals exhibit a decided variation in head form, as well as in dentition: some are more primitive and ape-like; others, such as Spy II, are more like the modern races. The Krapina variety is more broad-headed than the typical Neanderthal variety. ”
