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"Ellis has collected the results of investigations on almost every tissue of the body, which serve to show the universal presence of sexual differences. It is plain that there is a striking difference in the coloration of the typical male and female. This fact establishes the existence of sexual differences in the skin (cutis) and in the blood-vessels, and also in the bulk of the colouring-matter in the blood and in the number of red corpuscles to the cubic centimetre of the blood fluid. Bischoff and Rudinger have proved the existence of sexual differences in brain weight, and more recently Justus and Alice Gaule have obtained a similar result with regard to such vegetative organs as the liver, lungs and spleen. In fact, all parts of a woman, although in different degrees in different zones, have a sexual stimulus for the male organism, and similarly the parts of man towards a woman."