76 
Comparing the rate during the last five years with that 
during the first five the increase is 57*4 per cent ! 
We have seen that the increase in the mortality from 
small-pox was relatively much less among infants and young 
children than among adults ; hut with bronchitis the reverse 
of this took place. Thus in the five years 1854-58 the deaths 
of males under 1 year of age were 21 '2 percent of the total 
deaths at all ages, and under 5 years 3 6 3; but in the five 
years 1869-73 the numbers were respectively 25*9 and 41‘2, 
It is remarkable however that between the ages of 10 and 
25 there was a slight decrease, so that the curve represent- 
ing the variations in the mortality at different ages from 
bronchitis has two well marked maxima — one at ages under 
1 year, and the other between the ages of 55 and 65. The 
increase at ages under 1 year amounted to 497 per cent, 
and at ages between 55 and 65 it was 35-6 per cent. Du- 
ring the year 1873, out of every 19 deaths from all causes, 
two were due to bronchitis alone. In the 7 years 1848-54 
the proportion was 2 deaths from bronchitis out of every 
47 from all causes. 
I have already remarked that the increased mortality from 
bronchitis cannot be attributed to changes in the character 
of the seasons. It is however due to some cause which 
affects the entire population of the kingdom, both male and 
female, since I find that the increase has been general, and 
not confined to smoky towns and manufacturing districts, 
as will be seen from the following comparison of the death- 
rates in North Wales and three of the healthiest counties in 
England, Westmorland in the north, and Sussex and Dorset 
in the south, and in Lancashire, the most unhealthy county. 
Mean 
Death- 
rate, 
1854—63. 
Mean 
Death- 
rate. 
1864—73. 
Increase 
per Cent. 
Percentage 
of Total 
Death-rate, 
1854—63. 
Percentage 
of Total 
Death-rate, 
1864—73. 
ISTorth. Wales 
0-690 
1-092 
58-2 
3-32 
5-13 
Westmorland 
0-845 
1-265 
49-7 
4-66 
7-18 
Sussex 
0-945 
1-269 
34-2 
4-96 
6-85 
Dorset 
1-029 
1-468 
42-6 
5-41 
8-01 
Lancashire 
2-203 
3-000 
36-1 
8-48 
10-98 
