PROCEEDINGS OF SECTION G. 



Also, if /„ be taken equal to 100,000, we have — 

 kg— 100-000. 

 Consequently log k zz. 4 '95420, 

 and k — 89,991. 



Using these values to compute^ adjusted values of /«_ and 

 comparing with the figures in Table IV"., the following results are 

 obtained : — 



In this case again the agreement of the adjusted with the crude 

 results is verv satisfactory. 



9. Computation of Force of Mortality at Early Agks. 



An important use to which the constants just determined may 

 be put is that of obtaining the force of mortality at the early ages. 

 By the force of mortality at any age is meant the annual rate at 

 which mortality is operating at the exact moment of age specified. 

 It is, in other words, an instantaneous rate for the specified age 

 expressed in terras of its annual equivalent. If l^ denotes the number 

 of persons living at the exact age x, then —(//-« may be taken as 

 representing the infinitesimal number who die in the moment 

 succeeding age x, while — dlxjlx will represent the corresponding 

 momently rate of mortality and — dlx llx^x the equivalent annual 

 rate. 



It is this latter expression which is known as the force of 

 mortality, and is usually represented by the symbol fix. 



