In the few remarks to which I am now limited I shall not discuss the irritating and disputed question of co-education of the sexes, which can only be settled by experience. On this subject we have not yet sufficient facts for a broad induction. On the one hand, it would seem that so long as young men and women mingle freely together in amusements, at parties and balls, at the theatre and opera, in the lecture-room, in churches, and most public meetings, it is not probable that any practical evils can result from educational competition of the two sexes in the same class-rooms, especially when we consider that many eminent educators have given their testimony in its favor, so far as it has fallen under their observation and experience. But, on the other hand, the co-education of the sexes may imply that both girls and boys, by similarity of studies, are to be educated for the same sphere. Boys study the higher mathematics not merely for mental discipline, but in order to be engineers, astronomers, surveyors, and the like; so, too, they study chemistry, in its higher branches, to be chemists and physicians and miners. If girls wish to do this rough work, let them know that they seek to do men's work. If they are to do women's work, it would seem that they should give more attention to music, the modern languages, and ornamental branches than boys do, since few men pursue these things as a business. The question is, Is it wise for boys and girls to pursue the same studies in the more difficult branches of knowledge? I would withhold no study from a woman on the ground of assumed intellectual inferiority. I believe that a woman can grasp any subject as well as a man can, so far and so long as her physical strength will permit her to make exhaustive researches. There are some studies which task the physical strength of men to its utmost tension. If any woman has equal physical power with men to master certain subjects, let her pursue them; for success, even with men, depends upon physical endurance as well as brain-power. And thus the question is one of physical strength and endurance; and women must settle for themselves whether they can run races with men in studies in which only the physically strong can hope to succeed.