Taste VIIL 
PROCEEDINGS OF SECTION H. 
677 
Showing the average summer barometric pressure in years of 
low mortality :— 
Mortality per Average barometric 
100,000. pressure. 
1872 49°7 29°929 
1873 - 49°3 29°941 
1880 46°1 29°922 
1881 551 29°978 
TaBLE IX. 
Showing the average summer barometric pressure in years of 
high mortality :— 
| 
| Mortality per Average barometric 
100,000. pressure, 
1866 102-7 29°917 
1877 99°3 30°026 
1878 eae Ss 29°957 
1883 90:6 29915 
Unpleasant as it may be to have an ingenious hypothesis ex- 
ploded, it must be admitted that no support is to be derived 
from these tables for the suggestion that periods marked by low 
barometric pressure should correspond with periods of high 
typhoid mortality, the low pressure allowing free escape of 
emanations from the soil. The years of highest mortality were, 
of course, in two instances, 1869 and 1883, marked by a very 
low average of barometric pressure ; but in another instance, 
1877, that average was the highest of any of the years com- 
pared. And further, if the averages for the two groups are 
compared, it appears that for those in Table VIII. it was 
29-942, and for those in Table IX. 29-953, practically the same, 
any difference existing being against, rather than in favour of, the 
hypothesis, 
