ON THE INFLUENCE OF WEATHER UPON MORTALITY. 329 



This Table still leads us to the same opinion, — namely, that the relationship 

 existing between the amount of rainfall and the mortality from all causes is direct 

 over the whole year, although it may be inverse as regards those months which 

 in the latter Table are distinguished by the sign + . 



Humidity. — It remains to be seen what may be the character of the relation- 

 ship between the death-rate from all causes and the amount of moisture in the 

 atmosphere, as indicated by the humidity column. The sections of Table C give 

 us, with respect to humidity, the following results : — 



Sections. ' Mortality. Humidity (Sat. = 100). 



Maximum Section, 269-49 87 



Major Section, 233-25 86 



Minor Section, 214 26 84 . 



Minimum Section, ....'.... 185-85 84 



Means, 225-71 85 



In the foregoing Table we have an indication of a direct relationship between 

 its two elements, — the greater the humidity the greater the mortality, although 

 in the minor and minimum sections the figures representing the average amount 

 of moisture are identical. In the following Table I have taken the average mor- 

 tality of those of the six corresponding months whose humidity is above the 

 mean of the six, and the average mortality of those months whose humidity is 

 below the mean of the six. The results are seen thus : — 



Average Mortality of those Months -whicli have 



a Humidity above the Means of the Six corresponding 



Months. 



January, (Aver. Mean Temp. 



February, ( „ 



March, 



April, 



May, 



June, 



July, 



August, 



September, 



October, (Aver. Mean Temp 



November, ,, „ 



December, 



Mean, 



36°-73) 

 39°-85) 



236-86 



244-10 



+ 253-36 



+ 251-82 



+ 224-70 



+ 210-16 



+ 208-87 



+ 189-50 



+ 188-55 



48°-30) 189-70 



39°-97) 232-00 



+ 249-70 



223-28 



Average Mortality of those Months which have 



a Humidity below the Means of the Six corresponding 



Months. 



January, (Aver. Mean Temp. 38°-20) 293-86 + 

 February, ( „ „ 34°-90) 284-15 + 



March, .... 246-60 



April, .... 22490 



May, .... 193-50 



June, .... 207-06 



July, .... 195-90 



August, .... 189-10 



September, . . 186-15 



October, (Aver. Mean Temp. 46°-00) 206-70 + 

 November, ( „ „ 39°-] 0) 242-20 + 



December, . . . 246-03 



Mean. 



226-346 



Here, for the first time, we meet with an indication of a dry air, irrespective 

 of temperature, being more fatal than a humid atmosphere. Nevertheless, eight 

 of the months tend to a conclusion in conformity with that which the former 

 Tables have suggested, four of the months only conducing to an opposite opinion. 

 If we seek an explanation in the mean temperature of the several months which 

 determine the result of the latter table, we find that, with the exception of 



VOL. XXIII. PART II. 4 X 



