532 



HUMAN BIOLOGY 



the population, the negro, has the lowest survival value as a 

 group (vital index generally less than lOo). Measured by 

 this same test the population, as a whole, of England and 



1901 03 05 07 09 11 13 15 17 19 21 23 25 



Yec^rs 



Fig. 3. Vital index (100 births: deaths) of population of France during 20th 



century. 



Wales is today more vigorous than it was in 1838. This is 

 a plain fact. Whether this fact is, sociologically or eugeni- 

 cally considered, a bad thing or a good thing, is the kind 

 of question which, as has already been pointed out, has 

 no place in an objective, quantitative science of human 

 group biology. 



For this, our present point of view, the interesting and 

 important feature of the case is the extraordinary self- 

 regulation of the population growth during this long period, 

 by intercorrelated changes in birth rates and death rates. 

 During the period under review the birth rate steadily rose 



