thighs still shorter lower legs, and relatively to the whole short upper extremity³⁹ a still shorter lower extremity—a very striking evidence of the ineptitude of woman for the expenditure of physiological energy through motor action.⁴⁰

The strength of woman, on the other hand, her capacity for motion, and her muscular mechanical aptitude are far inferior to that of man. Tests of strength made on 2,300 students of Yale University⁴¹ and on 1,600 women of Oberlin College⁴² show the mean relation of the strength of the sexes, expressed in kilograms:

The average weight of the men was 63.1 kilograms, and of the women 51 kilograms; and, making deduction for this, the strength of the men is still not less than twice as great as that of the women. The anthropometric committee reported to the British Association in 1883 that women are little more than half as strong as men.

The first field day of the Vassar College Athletic Association was held November 9, 1895, and a comparison of the records of some of the events with those of similar events at Yale University in the corresponding year gives us a basis of comparison:⁴³

Miss Thompson, whose results were obtained in a psychological laboratory, concludes that in reactions where strength is involved men are clearly superior to women, and this is the only respect in which she finds a marked difference:

Motor ability in most of its forms is better in men than in women. In strength, rapidity of movement, and rate of fatigue they have a very decided advantage. These three forms of superiority are probably all expressions of one and the same fact—the greater muscular strength of men. Men are very slightly superior to women in precision of movement. This fact is probably also connected with their superior muscular force. In the formation of a new co-ordination women are superior. The superiority of men in muscular strength is so well known that it is a universally accepted fact. There has been more or less dispute as to which sex displayed greater manual dexterity. According to the present results, that depends on what is meant by manual dexterity. If it means the ability to make very delicate and minutely controlled movements, then it is slightly better in men. If it means ability to co-ordinate movements rapidly to unforeseen stimuli it is clearly better in women.⁴⁴

We have no other than a utilitarian basis for judging some variations advantageous and others disadvantageous. We can estimate them only with reference to activity and the service or disservice to the individual and society implied in them, and a given variation must receive very different valuations at different historical periods in the development of the race. Departures from the normal are simply nature's way of "trying conclusions." The variations which have proved of life-saving advantage have in the course of time become typical, while the individuals in which unfavorable variations, or defects, have occurred have not survived in the struggle for existence. Morphologically men are the more unstable element of society, and this instability expresses itself in the two extremes of genius and idiocy. Genius in general is correlated with an excessive development in brain-growth, stopping dangerously near the line of hypertrophy and insanity; while microcephaly is a variation in the opposite direction, in which idiocy results from arrested development of the brain, usually through premature closing of the sutures; and both these variations occur more frequently in men than in women. There is also evidence that defects in general are more frequent in men than in women.

A committee reported to the British Association for the Advancement of Science, in 1894,⁴⁵ that of some 50,000 children (26,287 boys, and 23,713 girls) seen personally by Dr. Francis Warner (1892-94) 8,941 were found defective in some respect. Of these, 19 per cent. (5,112) were boys, and 16 per cent. (3,829) were girls.

An examination of 1,345 idiots and imbeciles in Scotland by Mitchell showed the following distribution of the sexes:

showing that "the excess of males is much greater among idiots than among imbeciles; in other words, that the excess of males is most marked in the graver forms of the disease."⁴⁶

A census of the insane in Prussia in 1880 showed that 9,809 males and 7,827 females were born idiots. Koch's statistics of insanity show that in idiots there is almost always a majority of males, in the insane, a majority of females. But the majority of male idiots is so much greater than the majority of female insane that when idiots and insane are classed together there remains a majority of males.