Meantime, it is probably true that the female, as mother of the race, is more important biologically than the male, since she both furnishes germ plasm and nourishes the newly conceived life. The latest studies, along lines laid down by Mendel, seem to indicate that the female brings to the new creation both male and female attributes, while the male brings only male qualities. Thus when either sex sinks into insignificance, as sometimes happens in lower forms of life, it is generally the male which exists merely for purposes of reproduction.[7] [7] C.W. SALEEBY, _Woman and Womanhood_, Chapter V. New York: Mitchell Kennerley, 1911. The differences in the nervous systems of men and women are now fairly established on the quantitative side. Marshall has shown that if we compare brain weight with the stature in the two sexes there is a slight preponderance of cerebrum in males; but if the other parts of the brain are taken into consideration, the sexes are equal.[8] Havelock Ellis has carefully gathered the results of many investigators and declares that woman's brain is slightly superior to man's in proportion to her size.[9] But these quantitative differences are now felt to have comparatively little significance; and of the relative qualities of the brain substance in the two sexes we know nothing positively. In fact, if we give a scientist a section of brain substance he cannot tell whether it is the brain of a man or a woman. [8] MARSHALL, _Journal of Anatomy and Physiology_, July, 1892. [9] HAVELOCK ELLIS, _Man and Woman_, p. 97, Contemporary Science Series. It is very probable that the average woman's mind is capable of much the same activity as the average man's mind, given the same heredity and the same training. They are both alike capable of remarkable feats of imitation, and an ordinarily intelligent man could probably learn to wear woman's clothes, and walk as she generally walks, so as to deceive even a jury of women, if there were a motive to justify the effort. Women also can perform, and they do perform, most of the feats of men. At the same time it is desirable to note present differences in modes of thinking and feeling, for while they may have been produced by environment and ideals, and may hence give way to education, they must be reckoned with in making the next steps. In the chapter on education we shall discuss certain academic peculiarities of women's minds, but here we are interested in seeing what fundamental differences characterize the thinking of the sexes.