4. On the Variations of the Fertility and Fecundity of Women according to Age

J. Matthews Duncan
1866 Proceedings of the Royal Society of Edinburgh  
This paper was divided into four parts. In the first part it was shown :—1. That the actual, not the relative, fertility of our female population, as a whole, at different ages, increases from the commencement of the child-bearing period of life until the age of 30 is reached, and then declines to its extinction with the child-bearing faculty.2. That the actual fertility is much greater before the climax, 30 years, is reached, than after it is passed.
doi:10.1017/s0370164600040670 fatcat:h4h5flyedrg7dflcjsvknq25wy