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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