320 



DR R. E. SCORESBY- JACKSON 



In the next table we have three factitious years constituted,— the first, by those 

 of the several corresponding months which possess the highest barometric read- 

 ings ; the second, by those which exhibit the lowest barometric readings ; and the 

 third, by the means of the six corresponding months : — 



Montiis 



Highest 



Lowest 



Mean 



Mortalit)' 



Mortality 



Mean 





Barometer. 



Barometer. 



Barometer. 



with Highest. 



with Lowest. 



Mortality. 



January, .... 



30-065 



29-529 



29-813 



214-0 



2808 



265-3 



February, . 









30052 



29-681 



29-869 



251-3 



228-1 



257-4 



March, . . 









29-852 



29507 



29-701 



257-8 



220-2 



249-8 



April, . . 









30-177 



29-751 



29-916 



223-5 



222-7 



242-8 



May, . . 









30-070 



29810 



29-923 



225-4 



228-4 



219-5 



June, 









30-032 



29-674 



29-892 



219-3 



219-1 



208-6 i 



July, . . 









30-050 



29-735 



29-851 



181-3 



192-3 



204-5 



August, 









30014 



29-575 



29-840 



2241 



192-4 



189-4 1 



September, 









29-979 



29-722 



29-845 



195-9 



177-7 



187-7 



October, 









29-936 



29-620 



29-784 



1731 



204-4 



198-2 



November, 









30115 



29-855 



29-881 



231-3 



2360 



237-1 



December, . 







30-020 



29-651 



29-806 



241-4 



263-4 



247-9 



Means, . 







30-030 



29-676 



29-843 



219-9 



222-1 



225-7 



30-030 



Mortality, 



219-9 



29-676 



3) 



222-1 



29-843 





225-7 



I n this table there is evidently a good deal of conflict ; but upon the Avhole 

 year it corroborates the indications of the preceding tables, inasmuch as the aver- 

 age mortality with a low barometer is higher than that with a high barometer. 

 But it is curious to observe that the average barometric reading of the whole 

 term of seventy-two months corresponds with a higher necrological reading than 

 either the absolute highest or the absolute lowest readings of the barometer, as 

 is more distinctly seen thus : — 



Mean of the Absolute Highest Barometric Readings, 



,, Lowest „ 



Mean of the whole Term of 72 Months, .... 



This, then, would indicate that high and low barometric readings are both more 

 conducive to vitality than a medium reading ; and, moreover, it serves to deepen 

 the impression that a low barometer is more fatal than a high reading ; because, 

 although 29-843 is the exact mean of the whole term of seventy-two months, 

 nevertheless it approximates nearer to the mean of the absolute lowest than to 

 the mean of the absolute highest, for 30-030 + 29-676^2=29'853. 



In order to ascertain whether any month or season would give a stronger indi- 

 cation of the influence of atmospheric pressure upon the death-rate than is shown 

 by the mere absolute highest and lowest barometric readings, and also whether 

 season has any modifying power over such influence, I have classified as many of 

 the corresponding months into separate groups as would in any way contrast, 

 touching the circumstance of atmospheric pressure : — 



