EPIDEMIOLOGY OF TUBERCULOSIS KOCH. 



667 



Very characteristic examples of favorable indications in the mor- 

 tality of consumption are shown by Hamburg (Table 5) and Boston 

 (Table G). 



Before 1860 Hamburg lost by consumption 37 for every 10,000 

 inhabitants, and in 1880 the figure stood at 33.5. In 1907 the mor- 

 tality had decreased to 13.7. 



Boston had in 1886 a mortality of about 40, in 1907 it was 18.5. 



Table 6. — Mortality from consumption, at Boston. 



IT 



3$ 



25 



20 



Lii ';.''■ 



These figures are still more significant if we compare them with 

 those of cities which are exposed to conditions similar to those of 

 Hamburg and Boston. For this purpose we will compare Hamburg 

 with Berlin (Table 7) and Boston with New York (Table 8). 



The mortality curves of Hamburg and Boston descend at once and 

 the decrease continues at a uniform rate, while in Xew York and 

 especially in Berlin it has slackened for several years past. 



The examples I have submitted, and which might easily be in- 

 creased in number, show that there can be no question of a general. 



