Human beings form no exception to that which holds true for all living beings throughout nature. Man is not exempt from natural laws. Viewed physiologically, he is merely the most highly developed animal. Of course, many persons refuse to admit this. Thousands of years ago ancient peoples, although they knew nothing of modern science, held more rational views in regard to many human problems, than a great many of our contemporaries, and, what is more noteworthy still, their views that were based on experience, were put into practice. We praise and admire the strength and beauty of the men and women of ancient Greece; but we forget that it was not the climate of this beautiful country that had such a favorable influence upon the nature and development of its population, but the educational maxims that were consistently carried out by the state, and that were destined to combine beauty, strength and skill with mental sharpness and vigor. Indeed the mental development of woman was neglected even then, but not so her physical development.[66] In Sparta where physical culture of both sexes was most extensively practiced, boys and girls went about naked until the age of puberty, and together they joined in physical exercises, games and wrestling-matches. The display of the nude human body, the natural treatment of natural things, prevented the extreme sexual irritation that is mainly caused by an artificial separation of the sexes from childhood on. The body of one sex was no mystery to the other. No dallying with ambiguities could arise. Nature was regarded as such. Each sex took pleasure in the beauty of the other. To a natural, untrammeled relation of the sexes must mankind return; we must cast aside the unsound spiritualistic conceptions concerning human affairs and create methods of education that shall bring about a physical and mental regeneration. The prevailing conceptions in regard to education, especially the education of women, are still exceedingly reactionary. That a woman should possess such qualities of character as strength, courage and determination, is decried as unwomanly, and yet no one can deny that by means of such qualities she will be better enabled to protect herself. But her physical development is hampered, just like her mental development. This is due in no small degree to the irrational mode of dress. Woman’s dress not only interferes with her physical development, it frequently does her direct bodily harm; and yet there are few, even among physicians, who dare to oppose it. Fear of displeasing the patient causes them to be silent or even to flatter her follies. The modern style of dress prevents women from freely exercising their strength, hampers their physical development, and creates a feeling of helplessness in them. Moreover, woman’s dress endangers the health of her environment, for at home and on the street she is a walking generator of dust.