Note (return) — ORGANIC DIFFERENCES IN THE SEXES

The numerical relation of the sexes at birth seems to be more variable in those regions where economic conditions and social usages are least settled, but in civilized countries the relation is fairly constant, and statistics of 32 countries and states between the years 1865 and 1883 show that to every 100 girls 105 boys are born, or including stillborn, 100 girls to 106.6 boys.82 But the mortality of male children so much exceeds that of female that at the age of five the sexes are about in numerical equilibrium; and in the adult population of all European countries the average numerical relation of the sexes is reckoned as 102.1 women to 100 men. Von Oettingen gives a representative table;83 compiled from statistics of eight European countries, showing that (omitting the stillborn) 124.71 boys to 100 girls die before the end of the first year, and that between the years of 2 and 5 the proportion is 102.91 boys to 100 girls; or, about 25 per cent. excess of boys in the first year, and 3 per cent. in the years between 1 and 5. In the intra-uterine period and at the very threshold of life the mortality of males is still greater. The figures of Wappaeus were 100 stillborn girls to 140.3 boys; Quetelet gave the proportion as 100:133.5; and the statistics of fourteen European countries during the years 1865-83 show that 130.2 boys were stillborn to every 100 girls.84 So that, while more boys than girls are born living, still more are born dead. That this astonishingly high mortality is due in part to the somewhat larger size of boys at birth and the narrowness of the maternal pelvis is indicated by the statement of Collins, of the Rotunda Lying-in Hospital, Dublin, that within half an hour after birth only 1 female died to 16 males; within the first hour 2 females to 19 males; and within the first 6 hours, 7 females to 29 males.85 But that this explanation is not sufficient is shown by the fact that a high mortality of boys extends through the whole of the first year, and through five years, in a diminishing ratio, and also that the tenacity of woman on life, as will be shown immediately, is greater at every age than man's except during a period of about five years following puberty. "There must be," says Ploss, "some cause which operates more energetically in the removal of male than of female children just before and after birth;"86 but, besides the more violent movement of boys and their greater size, no explanation of the cause has been advanced more acceptably than Haushofer's teleological one, quoted by Ploss, that Nature wished to make a more perfect being of man and therefore threw more obstacles in his way. A satisfactory explanation is found if we regard the young female as more anabolic, and more quiescent, with a stored surplus of nutriment by which in the helpless and critical period of change from intra- to extra-uterine conditions it is able to get its adjustment to life. The constructive phase of metabolism has prevailed in them even during fetal life. That there is need of a surplus of nutrition in the child at birth, or that a surplus will stand it in good stead, is indicated by the results of the weighing of children communicated by Winckel to the Gynaecological Society in Berlin in 1862. Winckel weighed 100 new-born children, 56 boys and 44 girls, showing that birth was uniformly followed by a loss of weight. The average diminution was about 108 grams the first day, and but little less the second day. At the end of five days the loss was 220 grams, six-sevenths of which occurred during the first two days.87 The tendency to decreased vitality in girls after maturity and before marriage, just referred to, must be associated with the katabolic changes implied in menstruation and the newness to the system of this destructive phase of metabolism.