Page:Transactions of the Provincial Medical and Surgical Association, volume 2.djvu/217

 respective ages of all who had died in a period of ten years; viz. from 1813 to 1822 inclusive. By means of the results thus obtained, Mr. Rankin was enabled to calculate the expectations of life at the several ages in this locality.

If we divide the whole mortality stated in the above table by 10, in order to obtain the average annual number of deaths, and make the result the divisor of the population the ratio of mortality will be about 1 in 45. In London the ratio is 1 in 40; in Liverpool the same; in Birmingham 1 in 43.