144 



BIOLOGY OF DEATH 



fancy and drop at a practically constant rate to a low 

 point in early youth. In infancy the heaviest mortality 

 in males is due to the breakdown of organs of endodermic 



r l f OOO rz 



too 



O 







10 



E 



O.I 



5 1O 15 20 25 3O 35 40 45 



AGE 



6O 65 7O '/5 8O &5 9O 95 IOO 



FIG. 39. Showing specific death rates in males according to the germ layer from which the 



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 



