With page 313 we pass to the question of the length of time during which certain organs grow, especially the brain. "If we could prove that the brain of certain races ceases to develop at an earlier period than that of others, the inference of the inferiority of race would seem highly probable." Now, this is precisely what many naturalists of the first rank affirm is the case with the Negro. But it is here declared, "At the present time no satisfactory basis for such comparisons exists." Possibly;--we recognize the difficulties of the case: still, the returns thus far received, so far as they indicate anything at all, do indicate a much shorter period of development for the Negro (see p. 147). The next question (p. 314) is the crucial one of brain-weights--"the one anatomical feature which bears directly upon the question at issue. It would seem that the greater the central nervous system, the higher the faculty of the race and the greater its aptitude to mental achievements.... There are sufficient data available to establish beyond a doubt the fact that the brain-weight of the whites is larger than of most other races, particularly larger than that of the negroes. That of the white male is about 1370 grammes. The investigations of cranial capacities are quite in accord with these results. According to Topinard, the capacity of the skull of males of the neolithic period of Europe is about 1560 cc.; that of modern Europeans is the same; of the Mongoloid race 1510 cc.; of African negroes 1405 cc., and of negroes of the Pacific ocean 1460 cc. Here we have, therefore, a decided difference in favor of the white race. These differences cannot be explained as the effect of difference in stature, the negroes being at least as tall as the Europeans."