It is utterly impossible without injury to hold girls to the same standards of conduct, regularity, severe moral accountability, and strenuous mental work that boys need. The privileges and immunities of her sex are inveterate, and with these the American girl in the middle teens fairly tingles with a new-born consciousness. Already she occasionally asserts herself in the public high school against a male teacher or principal who seeks to enforce discipline by methods boys respect, in a way that suggests that the time is at hand when popularity with her sex will be as necessary in a successful teacher as it is in the pulpit. In these interesting oases where girl sentiment has made itself felt in school it has generally carried parents, committeemen, the press, and public sentiment before it, and has already made a precious little list of martyrs whom, were I an educational pope, I would promptly canonize. The progressive feminization of secondary education works its subtle demoralization on the male teachers who remain. Public sentiment would sustain them in many parental exactions with boys which it disallows in mixed classes. It is hard, too, for male principals of schools with only female teachers not to suffer some deterioration in the moral tone of their virility and to lose in the power to cope successfully with men. Not only is this often confessed and deplored, but the incessant compromises the best male teachers of mixed classes must make with their pedagogic convictions in both teaching and discipline make the profession less attractive to manly men of large caliber and of sound fiber. Again, the recent rapid increase of girls, the percentage of which to population in high schools has in many communities doubled in but little more than a decade, almost necessarily involves a decline in the average quality of girls, perhaps as much greater for them as compared with boys as their increase has been greater. When but few were found in these institutions they were usually picked girls with superior tastes and ability, but now the average girl of the rank and file is, despite advanced standard, of admission, of an order natively lower. From this deterioration both boys and teachers suffer, even though the greatest good for the greatest number may be enhanced. Once more, it is generally admitted that girls in good boarding-schools, where evenings, food, and regimen are controlled, are in better health than day pupils with social, church, and domestic duties and perhaps worries to which boys are less subject. This is the nascent stage of periodicity to the slow normalization of which, during these few critical years, everything that interferes should yield. Some kind of tacit recognition of this is indispensable, but in mixed classes every form of such concession is baffling and demoralizing to boys.