The "sacred number three," which we are told "dominates the human frame," dominates also the whole being. There is the physical, the moral, and the mental; and we are not to cast such a reflection upon the Author of our being, as to suppose that the proper development of the one must be at the expense of the other. If God demands more of woman's physical nature than of man's, he has wisely provided for it, within that nature. Faith in his benevolence leads us to this conclusion. It is just as true, that where much will be required, much has been given, as that where much has been given, much will be required. When woman learns the laws which govern her physical nature, and has the courage to live in accordance with those laws, it will be found that she has strength to be a woman, a Christian and a scholar. It is just as true in her case as in man's, that proper brain activity stimulates physical activity. There are many sickly girls to be found in our schools, but they are often sickly when they come to us; often, too, under the seeming garb of health, the seeds of disease are already germinating, and it is time, not study, which brings them to the surface. When mothers are able to send us strong, healthy girls, with simple habits and unperverted tastes, we will return to them and the world strong, healthy women, fitted, physically and mentally, for woman's work. It is continuous education, not co-education, which Dr. Clarke really condemns; but every teacher knows that continuity of effort is essential to sound mental development, and that this off-and-on method, which he seems to recommend, would destroy all order in the school, and make all work in the class-room impossible. If, then, his theory--that for physiological reasons girls cannot endure continuous study--is the true theory, not only our colleges and universities ought to remain closed against women, but all our schools for girls over fourteen years of age ought to be closed also, and the pupils sent home, to receive such instruction as they can from private teachers, at such times as their bodies can afford to lend time to their heads.