Beside the improper mental education, the improper or insufficient physical education in regard to the purposes of nature, remains to be considered. All physicians are agreed that woman’s education for her profession of motherhood is almost entirely neglected. “Soldiers are trained in the use of their weapons, and mechanics in the use of their tools. Every profession requires preliminary study. Even the monk has his noviceship. Only the woman is not educated for her serious maternal duties”.[68] Nine tenths of all maidens who are given an opportunity to marry, enter matrimony in complete ignorance of motherhood and its duties. The unpardonable prudery that prevents mothers from speaking to their grown daughters about the important functions of sex, leaves them in a state of densest ignorance concerning their duties to their husbands and to themselves. The entrance into marriage means to most women entrance into an utterly strange world. Their conceptions of marriage are purely imaginative, drawn from novels of doubtful value, and are usually very foreign to reality.[69] Another source of differences may be found in the lack of practical knowledge of housekeeping that is still quite essential in present day marriage, though women have been relieved of many domestic activities that were formerly inevitable. Some women are deplorably ignorant of household duties because they consider themselves superior to such work and regard it as a task for servants only. Others, daughters of the proletariat, are equally ignorant, because the struggle for existence compelled them to toil in the factory from morning until night, and they found no time to prepare for their future profession of housekeeper. It becomes more and more evident that the trend of development makes individual housekeeping unpractical, and that it can be maintained only by an irrational sacrifice of time and money. There is still another cause that to many men destroys the purpose of marriage: the physical enfeeblement of women. The food we eat, the manner in which we live, the conditions of our work and the character of our amusements, all tend to act more destructively than favorably upon our physical condition. Rightly is our age termed a nervous age. But nervousness leads to physical degeneration. Anaemia and nervousness exist in an especially marked degree among women. This physical degeneration is fast becoming a social calamity, and if it would continue to exist for several generations more, without our being able to procure more normal conditions of development, it would ultimately lead to race destruction.[70]