Abstract
It has been known for some time that male and female reproduction rates may give widely divergent results, even when calculated from the same population. In this paper the author examines the mathematical relationships between the male and female reproduction rates in the stable population and obtains the conditions under which the same true rate of natural increase would be yielded both by the male and female rates. He shows that these differences may ultimately be reduced to differences in the nuptiality of the two sexes and illustrates his theory by an arithmetical example.

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