There is also no ground for the assumption that the brain of woman is inferior to that of man; for, while the average brain of woman is smaller, the average body weight is also smaller, and it is open to question whether the average brain weight of woman is smaller in proportion to body weight.[257] The importance of brain weight in relation to intelligence, moreover, has usually been much exaggerated by anthropologists; for intelligence depends on the rapidity and range of the acts of associative memory, and this in turn on the complexity of the neural processes. Brains are, in fact, like timepieces in this respect, that the small ones work "excellent well" if they are good material and well put together. Although brains occasionally run above 2,000 grams in weight (that of the Russian novelist Turgenieff weighed 2,012), the brains of many eminent men are not distinguished for their great size. That of the French statesman Gambetta weighed only 1,160 grams. It must be borne in mind also that there are many individuals among the lower races and among women having brain weight much in excess of that of that of the average male white. Of all the possible ways of treating the brain for the purpose of testing its intelligence, that of weighing is the least satisfactory, and has been most indefatigably practiced. A better method, that of counting the nerve cells, has been lately introduced, but to treat a single brain in this way is a work of years, and no series of results exists. In the meantime Miss Thompson, in co-operation with Professor Angell, has completed a study of the mental traits of men and women on what is perhaps the best available principle--that of a series of laboratory tests which eliminate or take into consideration differences due to the characteristic habits of the two sexes. Her findings are probably the most important contribution in this field, and her general conclusion on differences of sex will, I think, hold also for differences of race: The point to be emphasized as the outcome of this study is that, according to our present light, the psychological differences of sex seem to be largely due, not to difference of average capacity, nor to difference in type of mental activity, but to differences in the social influences brought to bear on the developing individual from early infancy to adult years. The question of the future development of the intellectual life of women is one of social necessities and ideals rather than of the inborn psychological characteristics of sex.[258]