530 



HUMAN BIOLOGY 



this fact fully, however, it is necessary to resort to graphical 

 presentation. The vital index and birth rate data from Table 

 V are shown graphically in Figure 2. 



360 



320 



280 



210 



200 



i60 



i20 



80 



40 



18^0 50 60 70 SO 90 1900 10 20 



Years 



Fig. 2. Trend of vital index (lOO births: deaths) and crude birth rate in 

 England and Wales, 1838-1920, inclusive. 



It is at once apparent that the ratio of births to deaths in 

 England and Wales had but a slow but on the whole even 

 and steady tendency to increase from 1838 to 19 14. This 



