ON THE INFLUENCE OF WEATHER UPON MORTALITY. 



335 



The relationship existing between the mean temperature of the month and its 

 death-rate from zymotic diseases is seen in the following table, in which, out of 

 the seventy-two months, those with the highest and those with the lowest death- 

 rate from such causes are selected : — 





Jan. 



Feb. 



March. 



April. 



May. 



June. 



Average. 



Mean temperature of the months in which 1 

 the highest death-rate occurred, . J 



Mean temperature of the months in which } 

 the lowest death-rate occurred, . . j 



39-6 

 39-3 



39-3 

 35-8 



39-2 

 39-5 



42-7 

 454 



49-8 

 49-5 



58-9 

 57-2 



47-24 

 47-36 



1 



July. 



August. 



Sept. 



Oct. 



Nov. 



Dec. 



Mean temperature of the months in which ) 

 the highest death-rate occurred, . j 



Mean temperature of the months in which ) 

 the lowest death-rate occurred, . , j 



56-0 

 590 



60-0 

 560 



56-1 



53-7 



46-0 

 49 5 



394 

 38-5 



39-9 



44-9 



Hence it appears that the influence of temperature upon the death-rate caused 

 by zymotic diseases as a class is variable, and that the above data afford no 

 indication of any general law. 



The following table is constructed upon the same principle as the former, and 

 refers to the mean height of the barometer : — 



Jan. 



Feb. 



March. 



April. 



May. 



29-864 



29-840 



29-804 



29-767 



29-959 



30-065 



29-998 



29-852 



30-177 



29-823 



June. 



Average. 



Mean height of the barometer for the "| 

 months in which the highest death- V 

 rate occurred, J 



Mean height of the barometer for the ^ 

 months in which the lowest death- v 

 rate occurred, j 



Mean height of the barometer for the ^ 

 months in which the highest death- V 

 rate occurred, ....... j 



Mean height of the barometer for the 

 months in which the lowest death- 

 rate occurred, 



30-032 



29-961 



July. 



29-887 



30-050 



August. Sept. 



Oct. 



30-014 



29-885 



29-882 



29-723 



29-784 



29-936 



Nov. 



29956 



29544 



Dec. 



29-703 

 29-989 



29-874 

 29-917 



The preceding table scarcely points to any general law, unless it be this, that 

 during the colder months of the year the relationship existing between the height 

 of the barometer and the death-rate from zymotic diseases is inverse, whilst during 

 the warmer months it is direct. The months July and November do not conform 

 to such a law ; it may be remarked, however, that the July with the high death- 

 rate was much cooler than the other, whilst the November with the high death- 

 rate was rather warmer than its associate. 



