It is claimed that man is made for sustained, and woman for periodic effort. It is by no means certain that this is so, and if it be indeed a law of organization, then it must be a law which will dominate the whole life. It will not only keep a girl back from mastering her tools until the time for using them is passed, but it will interfere with her steady use of them through her whole life, shut her out from the markets of the world, and unfit her for all steady, consecutive duty, either public or private. Let no girl be deterred from steady and faithful work in the vain fear that she will unsex herself, and to a loving mother's needful anxieties let not this superfluous care be added. True, we may all make mistakes as to what is desirable, needful, or possible, but to the humble seeker after the right way, a clear sight will always come, and to the preposterous cautions, born of a morbid and unwise interference with the courses of life, I oppose these words quoted from that "physiology of Moses," which it is said that we have not outgrown: "Ye shall not offer unto the Lord that which is bruised or crushed or broken or cut;" these words are true, whether spoken of a dove's feathers or a girl's soul; or the still later and wiser words, "Take, therefore, no thought for the morrow, for the morrow shall take thought for the things of itself." The foundations of true manhood and true womanhood are fortunately laid too deep for our meddling. It is true that we may destroy the perfume of life, for men and women, by mistaken efforts and perverse guidance, but the fruit of our error is not immortal, and it is never too late to retrieve our false steps. So far from losing what is best in either sex, as we advance in life, we may be sure that increasing years will find it intensified; that so long as men and women live, they may, if they desire, they _must_, if they are faithful, grow more manly and more womanly. If they draw nearer to each other, as they sit hand in hand looking towards the sunset, it is only because they are both heirs of the immortal, seeking and gaining the same end. It is impossible to dismiss these considerations without touching afresh the subject of co-education. But we need not rest upon the family fact or the old common school system.