Coeducation involves, as its name implies, the education of a company of young men and women as a single body. To the two sexes alike are presented the same conditions of admission, of opportunities during the course, of requirements for the degrees, of guardianship, of discipline, of organization. The typical features are identical classrooms, libraries, and laboratories, occupied at the same time, under the same instructors; and the same honors for like work. Ordinarily all the instructors are men, although in a few universities professorships are held by women. Usually no dormitories or boarding-houses are provided for either the young men or women, and no more surveillance is kept over the one than over the other. This feature, however, is not essential. At Cornell, Oberlin, and elsewhere, often out of local necessity, buildings have been provided where the young women may--in some instances, must--live together under the ordinary regulations of home life, with a lady in charge. But in most of the higher coeducational institutions the principle has from the first been assumed that students of both sexes become sufficiently matured by eighteen years of home, school, and social life--especially under the ample opportunities for learning the uses of freedom which our social habits afford--safely to undertake a college course, and advantageously to order their daily lives. Of course all have a moral support in the advice and example of their teachers, and they are held to good intellectual work by the perpetual demand of the classroom, the laboratory, and the thesis.