636 



Mr. Alexander BucJian 



[March 25, 



diseases of the resi^iratory organs, the more marked of which are given 

 in Figs. 12 to 15. About one in eight of all deaths that occur is caused 

 by bronchitis, and one in sixteen by pneumonia; so that nearly one-fifth 

 of the deaths is occasioned by these two diseases of the respiratory 

 organs. Our researches appear to warrant the conclusion that the 

 greatest fatality from these diseases occurs when the temperature is 



Fig. 12. 



Asthma. 



Mean 



I i IJ It I I 1 

 Bronchitis. 



between 32° and 40°. In New York, where the mean winter tempera- 

 ture is 10°- lower than in London, the mortality from bronchitis and 

 pneumonia is greatly less ; and on the other hand, in Melbourne, where 

 the winter temperature is about 10°- higher than that of London, 

 the mortality from diseases of the respiratory organs forms but a 

 small fraction of the whole deaths. 



These four curves of the mortality from diseases of the respiratory 

 organs are substantially the same, each having its maximum in the 

 cold months, and its minimum in the warm months. Asthma shows. 



