A graph, plotted to show how soon after graduation these girls have married, demonstrates that the greatest number of them wed five or six years after receiving their diplomas, but that the number of those marrying 10 years afterward is not very much less than that of the girls who become brides in the first or second year after graduation (see Fig. 35). C. S. Castle's investigation[107] of the ages at which eminent women of various periods have married, is interesting in this connection, in spite of the small number of individuals with which it deals: _Century_ _Average age_ _Range_ _Number of cases_ 12 16.2 8-30 5 13 16.6 12-29 5 14 13.8 6-18 11 15 17.6 13-26 20 16 21.7 12-50 28 17 20.0 13-43 30 18 23.1 13-53 127 19 26.2 15-67 189 Women in coeducational colleges, particularly the great universities of the west, can not be compared without corrections with the women of the eastern separate colleges, because they represent different family and environmental selection. Their record none the less deserves careful study. Miss Shinn[108] calculated the marriage rate of college women as follows, assuming graduation at the age of 22: _Women over_ _Coeducated_ _Separate_ 25 38.1 29.6 30 49.1 40.1 35 53.6 46.6 40 56.9 51.8 She has shown that only a part of this discrepancy is attributable to the geographic difference, some of it is the effect of lack of co-education. Some of it is also attributable to the type of education. The marriage rate of women graduates of Iowa State College[109] is as follows: 1872-81 95.8 1882-91 62.5 1892-01 71.2 1902-06 69.0 Study of the alumni register of Oberlin,[110] one of the oldest coeducational institutions, shows that the marriage rate of women graduates, 1884-1905, was 65.2%, only 34.8% of them remaining unmarried. If the later period, 1890-1905, alone is taken, only 55.2% of the girls have married. The figures for the last few classes in this period are probably not complete. At Kansas State Agricultural College, 1885-1905, 67.6% of the women graduates have married. At Ohio State University in the same period, the percentage is only 54.0. Wisconsin University, 1870-1905, shows a percentage of 51.8, the figures for the last five years of that period being: 1901 33.9 1902 52.9 1903 45.1 1904 32.3 1905 37.4 From alumni records of the University of Illinois, 54% of the women, 1880-1905, are found to be married.