to be 3.44, for the latest period studied 1.92. Among the Yale graduates it was found that the number of children per father had declined from 5.16 to 2.55.
Fig. 37.—During the period under consideration it declined steadily, although marriage was about as frequent and as early at the end as at the beginning of the period. It is necessary to suppose that the decline in the birth rate is due principally to voluntary limitation of families. J. C. Phillips, who made the above graph, thinks that since 1890 the birth rate among these college graduates may be tending slightly to rise again.
Figures were obtained from some other colleges,