122 



Transactions. — Miscellaneous. 



Table III. — Average Yearly Number of Deaths from Phthisis 

 per 10,000 of Population of each Sex of various Age-periods. 



The results given in this table for ages up to 65, and for 

 the first and last of the four periods considered, are illustrated 

 graphically in Plate IV. For ages over 65 the numbers of 

 cases are too small to give fair averages. 



This table shows that during the ages from 10 to 20 

 females are much more liable to death from phthisis than 

 males, but from 45 onwards the position is more than re- 

 versed. 



Phthisis is often regarded as a disease of youth, but this 

 table shows that though this is the case to a considerable 

 extent for females, yet for males from the age of 20 years r 

 when the chance of death from phthisis first becomes con- 

 siderable, it remains comparatively constant up to the age of 

 70 years, when a decrease sets in. 



Leaving out of further consideration the ages 65 and over, 

 because of the comparatively small number of cases they 

 supply, we see that for other ages the number of deaths per 

 10,000 of population fell off during the period under con- 

 sideration for the great majority of age-periods. In fact, in 

 the case of males the only age-period showing an appreciable 

 increase was that of 60-65, and in the case of females the 

 only age-periods showing an increase were those of 15-20 and 

 60-65, a>nd the increases in both these cases were compara- 

 tively slight. 



