163 
ings, and an insufficient supply of good water ; and that no 
material and permanent reduction in the rate of mortality 
can reasonably be hoped for until a close and careful study of 
the influence of changes in the state of the atmosphere upon 
the production and development of disease, has led to the 
discovery of the best means of guarding against and coun- 
teracting the effects of unfavourable changes of the weather • 
O O j 
and the people have been induced to avail themselves of 
such means to ward off or mitigate attacks of disease. 
In the reports of the Registrar General the causes of 
death are divided into five classes. 
I. Zymotic. 
II. Constitutional. 
III. Local. 
IY. Developmental. 
Y. Violent Deaths. 
The following table shows the number of deaths of males 
in Lancashire, in each class, during the years 1855-67 : — 
YEAR. 
I. 
II. 
CLASS 
III. 
IV. 
! V. 
Total Deaths 
from 
ascertained 
Causes. 
1855 
6,909 
5,548 
12,194 
3,968 
1,589 
30,208 
1856 
6,814 
5,444 
11,049 
3,598 
1,495 
28,400 
1857 
7,628 
5,476 
11,901 
3,859 
1,648 
30,512 
1858 
9,559 
5,296 
11,603 
3,899 
1,513 
31,870 
1859 
6,964 
4,862 
11,976 
3,769 
1,574 
29,145 
1860 
5,500 
5,049 
12,876 
3,988 
1,609 
29,013 
1861 
7,166 
5,394 
13,553 
4,477 
1,600 
32,190 
1862 
7,958 
5,304 
13,460 
4,157 
1,487 
32,366 
1863 
9,606 
5,319 
13,045 
4,071 
1,642 
33,683 
1864 
9,738 
5,506 
14,119 
4,284 
1,792 
35,439 
1865 
11,068 
5,958 
13,849 
4,700 
1,926 
37,501 
1886 
11,899 
6,207 
15,720 
4,868 
1,987 
40,681 
1867 
9,039 
6,162 
15,050 
4,968 
1,809 
37,028 
Tlie mean annual numbers for the eight years 1855-62, and the 
five years 1863-67 are : — 
1855-62 
7,312 
5,297 
12,325 
3,964 
1,564 
30,463 
1863-67 
10,270 
5,830 
14,356 
4,578 
1,831 
36,866 
The ratios of the numbers in each 
deaths are as follows 
class to the total number of 
1855-62 
•240 
T73 
•404 
T30 
•051 
1863-67 
•278 
T58 
•389 
•124 
•049 
" 
