Abstract
THE charts to be presented sketch in profile the natural history of measles, mumps, chicken pox, rubella, influenza, hepatitis and poliomyelitis in a universe of high-school boys throughout the twentieth century to date. Such information is, as far as I know, unique.Located in a small town about 25 miles from Boston, the St. Mark's School structure is an extended H-shaped building containing classrooms, dormitories, dining room, library, chapel and infirmary. An average annual enrollment of about 195 boarders, practically all of teen age, represents a gradual increase in population from 130 at the turn of the century. A pleasant . . .

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