334 



Mr. Lubbock on the Comparison of 



persons living at every age. For if /»„,„ be the lirobability of a 

 child at birth surviving n years, b„ the births n years previously, 

 the number of living in the population at the n* age is p„.„x b„, 

 and the ratio of the living at that age to the whole population 



• Po.n X b„ 



2 (;.„,„ X 6,,)' 

 I have calculated Tables VIII. and IX. in order to shew^ 

 the etfect which is produced by a given increase of the births. 

 Table VIII. shews the jiroportion of the living at each age, and 

 of the deaths to the whole population, when the law of mortality 

 obtains which is given by Table VII. The male births are 

 supposed to be to the female as 104 to 100. Table IX. is 

 calculated upon the supposition, that the law of mortality obtains 

 which is given by the Carlisle Table in Mr. Milne's work. Vol. II. 

 p. 564. The following are the results which are given by these 

 Tables : 



The ratio of the deaths to the population is nearly constant 

 according to both these Tables, whatever be the rate of increase 

 of the births ; when the ratio of the births to the population 



