Nor is this defective vision developed in men a peculiarity which is confined within the limits of our own country. In Europe, investigations analogous to those instituted in America have been followed by the same or similar results. Until a comparatively recent time this subject has received little or no attention, for the reason that the processes of civilization and the various activities of life have not, hitherto, demanded a correct or highly developed colour sense; but with the requirements of more highly civilized conditions, in vocations demanding more diversified and complicated physical and mental activities, it is plain that man, because of this organic imperfection, must labour under continuous disadvantages. Then add to defective vision his lack of physical endurance, his liability to various organic affections caused by structural defects, and his abnormal appetites which are constantly demanding for their gratification the things which are injurious to his mental and physical constitution, and we are enabled to judge, to some extent, of the obstacles against which, in the struggle for existence, the future man will find himself obliged to contend. Not only is man’s sense of sight less perfectly developed than is woman’s, but his sense of touch is less acute. The hand, directed as it is by the brain, is the most completely differentiated member of the human structure. It may almost be said of the hand, that it assists the brain in performing its functions. The female hand, however, is capable of delicate distinctions which the male has no means of determining. A dispatch from Washington says of the women of the Treasury Department: So superior is their skill in handling paper money that they accomplish results that would be utterly unattainable without them. It has been found by long experience that a counterfeit may go through half the banks in the country without being detected, until it comes back, often torn and mutilated, into the hands of the Treasury women. Then it is certain of detection. They shut their eyes and feel of a note if they suspect it. If it feels wrong, in half a minute they point out the incongruities of the counterfeit. Although throughout the ascending scale of life, the female has been expending all her energy in the performance of her legitimate functions—functions which, as we have seen, are of a higher order than those performed by the male, through causes which will be discussed farther on in these pages, within the later centuries of human existence—she has been temporarily overcome by the destructive forces developed in the opposite sex, forces which are without the line of true development, and which through overstimulation and encouragement have overleaped the bounds of normal activity, and have therefore become disruptive and injurious.