NO. I 



AIR AND TUBERCULOSIS HINSDALE 



95 



was a barometric pressure change exceeding .3 of an inch within 

 twenty-four hours than when the change was less. The hemor- 

 rhages appeared to be more frequent if there had been a change in 

 the opposite direction — a sudden fall. The cases observed were all 

 in the advanced stage. The conditions which appear to influence 

 groups of hemorrhages and deaths are barometric pressure, humidity 

 and cloudiness, each in turn appearing to be the most prominent 



•Deaths from 

 Tuberculosis -1910 



Humidity 

 "~i Temperature 



Deaths, L.A.Co. 

 Hospital 



Elevation 293 ft. 



Chart showing deaths from tuberculosis in the Los Angeles County Hospital 

 and in the city of Los Angeles in 1910. Rainfall, mean monthly temper- 

 ature and relative humidity are also shown. Courtesy of Dr. C. C. 

 Browning. 



index in exerting a limited determining influence. This is shown in 

 the two charts for November and December, 1912. Dr. Browning's 

 paper contains charts for six other months. 



Dr. Browning notes the influence of fog and remarks that the 

 " high fog " is regarded by many as one of the most desirable fac- 

 tors of the Southern California climatic condition. It is not fog 

 in the generally accepted meaning, for this " light veil " is neither 

 cold nor excessively moisture laden ; neither is it high, for its altitude 

 is less than a thousand feet. 



