144 



BIOLOGY OF DEATH 



fancy and drop at a practically constant rate to a low 

 point in early yonth. In infancy the heaviest mortality 

 in males is dne to the breakdown of organs of endodermic 



lfi60 



lOO 



o 

 o 





5 10 IS ZO Z5 30 35 40 -45 so J5 60 65 70 'IS eo as 30 95 100 



AGE 



Fio. 39. — Showing specific death rates in males according to the germ layer from which ths 



organs developed. 



origin. This part of the death rate accounts for some- 

 thing like 10 times as many deaths as either mesoderm or 

 ectoderm at this period of life. From about age 12 on in 



