Certain abnormalities in the condition of the sexual organs are occasionally found in men and women, but these cannot be compared with the production of sexless individuals that has taken place amongst other social creatures. I cannot accept the view that we are to see something analogous to the case of worker bees in the prohibition of sexual relations imposed by some religious systems on a certain number of individuals. But in any event there is little importance in this occurrence, which is rapidly becoming rarer. In recent times, both in Europe and the United States of America, there has been an active development of a femininist movement impelling women towards higher education. Women, no longer content with the avocations of mother and housewife, have pressed into professions such as law and medicine. There is a steady increase in the number of women who study at the Universities, and countries like Germany, which have tried to exclude women from higher studies, will soon have to yield before an irresistible pressure. Can we regard the results of this movement as analogous to the production of sexless workers which has taken place amongst social insects? I think not. It is undoubtedly true that a certain number of young women, who, for some reason or other are unlikely to marry, devote themselves to scientific study. In these cases, however, celibacy is the cause, not the result of the increased intellectual activity. On the other hand, it must be remembered that many women students of science eventually marry. In St. Petersburg, for instance, there were 1,091 women in the Medical School; of these 80 were already married and 19 were widows. Of the remaining 992, 436 or 44 per cent. married during the course of their studies. Observation of the femininist movement, which has lasted for more than forty years, shows that in most cases there is no tendency towards the formation of individuals resembling the infertile worker insects. Most lady doctors and learned women would like nothing better than to be the founders of a family. Even the women who have been most distinguished in the scientific world are no exception to the rule. In this relation it is very interesting to follow the details of the life of Sophie Kowalevsky, one of the most notable of learned women. In her youth, when she began to study mathematics, she would not admit that feelings of love had any importance. Later on, however, when she felt herself growing old, these sentiments awoke in her to such an extent that on the day when the prize of the Academy of Sciences was bestowed on her, she wrote to one of her friends, “I am getting innumerable letters of congratulation, but by the strange irony of fate, I have never felt so unhappy.”