Page:Popular Science Monthly Volume 78.djvu/401

Rh Table II. indicates the comparative distribution of grades A-E for the three groups—elementary, intermediate and advanced.

Not only are there extreme variations among different courses, but there are variations in the same courses from year to year that can not be accounted for, apparently, by any of our scientific studies in the

distribution of abilities among human beings. Fig. 5 shows the per cent, of As and the per cent, of Bs given in each of 53 courses at Harvard

College for 1906-07 contrasted with the same data concerning the same courses for the following year. The data are taken from the published rank lists and from the enrollment in courses as given