174 MESSRS. EANSOME AND VERNON ON THE INFLUENCE 



The chief discordance between the pneumonia and the 

 catarrh-bronchitis curves takes place in the latter end of 

 September and in October, which may possibly be due to 

 the greater influence of the moisture upon bronchitis and 

 catarrh than upon pneumonia ; the degree of humidity at 

 this time rises rapidly. 



In June and July 18^8, the catarrh-bronchitis curve 

 seems to answer more rapidly to the influence of the tem- 

 perature than the pneumonia curve does. 



Pleurisy. 



This disease is too irregular in its course to yield any 

 information in the present investigation, as the meteoro- 

 logical elements under consideration do not appear to have 

 any apparent connexion with it.* 



Continued Fever. 



It is difficult to trace any connection between the pro- 

 gress of this disease and the meteorological elements under 

 consideration, but on the whole high temperatures seem 

 rather favourable to its production, and extreme cold is 

 probably opposed thereto. 



From April 11th 18^7, the /ever curve, frequently fluc- 

 tuating, on the whole ascends until November yth, when a 

 sudden fall takes place, and it sinks rapidly until February 

 xo^th. In the first part of its course^ from May gth to 

 August 2.^th, it accompanies the rise of the mean tempe- 

 rature, but after the latter begins to fall the fever curve 

 goes on rising as steadily as before for two entire months 

 and is not affected by the advancing cold until the week 

 ending November 14/A, when the thermometer stands 

 at 45°. 



* Among the seasons of tlie year, winter more especially engenders the 

 disease, next autumn, spring less frequently, but summer most rarely. — 

 Aretseus, Causes and Symptoms of Acute Diseases, book i. chap. x. 



