Ellen Key's views are mainly contained in three books, _Love and Marriage_, _The Century of the Child_, and _The Women's Movement_, in which form they enjoy a large circulation, and are now becoming well known, through translations, in England and America. She carefully distinguishes her aims from what she regards as the American conception of progress in woman's movements, that is to say the tendency for women to seek to capture the activities which may be much more adequately fulfilled by the other sex, while at the same time neglecting the far weightier matters that concern their own sex. Man and woman are not natural enemies who need to waste their energies in fighting over their respective rights and privileges; in spiritual as in physical life they are only fruitful together. Women, indeed, need free scope for their activities--and the earlier aspirations of feminism are thus justified--but they need it, not to wrest away any tasks that men may be better fitted to perform, but to play their part in that field of creative life which is peculiarly their own. Ellen Key would say that the highest human unit is triune: father, mother, and child. Marriage, therefore, instead of being, as it is to-day, the last thing to be thought of in education, becomes the central point of life. In Ellen Key's conception, "those who love each other are man and wife," and by love she means not a temporary inclination, but "a synthesis of desire and friendship," just as the air is a mixture of oxygen and nitrogen. It must be this for both sexes alike, and Ellen Key sees a real progress in what seems to her the modern tendency for men to realize that the soul has its erotic side, and for women to realize that the senses have. She has no special sympathy with the cry for purity in masculine candidates for marriage put forward by some women of the present day. She observes that many men who have painfully struggled to maintain this ideal meet with disillusion, for it is not the masculine lamb, but much more the spotted leopard, who fascinates women. The notion that women have higher moral instincts than men Ellen Key regards as absurd. The majority of Frenchwomen, she remarks, were against Dreyfus, and the majority of Englishwomen approved the South African war. The really fundamental difference between man and woman is that he can usually give his best as a creator, and she as a lover, that his value is according to his work and hers according to her love. And in love the demand for each sex alike must not be primarily for a mere anatomical purity, but for passion and for sincerity.