As in the case of the Cannstadt skull, this again was fiercely debated, and finally the questions regarding it were allowed to remain in suspense.

But new discoveries were made: at Eguisheim, at Brux, at Spy, and elsewhere, human skulls were found of a similarly low type; and, while each of the earlier discoveries was open to debate, and either, had no other been discovered, might have been considered an abnormal specimen, the combination of all these showed conclusively that not only had a race of men existed at that remote period, but that it was of a type as low as the lowest, perhaps below the lowest, now known.
Research was now redoubled, and, as a result, human skulls and complete skeletons of various types began to be discovered in the ancient deposits of many other parts of the world, and especially in France, Belgium, Germany, the Caucasus, Africa, and North and South America.
But soon began to emerge from all these discoveries a fact of enormous importance.

The skulls and bones found at Cro Magnon, Solutre, Furfooz, Grenelle, and elsewhere, were compared, and it was thus made certain that various races had already appeared and lived in various grades of civilization, even in those exceedingly remote epochs; that even then there were various strata of humanity ranging from races of a very low to those of a very high type; and that upon any theory--certainly upon the theory of the origin of mankind from a single pair--two things were evident: first, that long, slow processes during vast periods of time must have been required for the differentiation of these races, and for the evolution of man up to the point where the better specimens show him, certainly in the early Quaternary and perhaps in the Tertiary period; and, secondly, that there had been from the first appearance of man, of which we have any traces, an UPWARD tendency.( 191) (191) For Wesley's statement of the amazing consequences of the entrance of death into the world by sin, see citations in his sermon on The Fall of Man in the chapter on Geology.

For Boucher de Perthes, see his Life by Ledieu, especially chapters v and xix; also letters in the appendix; also Les Antiquities Celtiques et Antediluviennes, as cited in previous chapters of this work.

For an account of the Neanderthal man and other remains mentioned, see Quatrefages, Human Species, chap.