20 [CHAP. I., PT. III.
On a population of 10,000, therefore, the mortality, according to these averages, would be-

Evacuated town of 10,000
= 175
Non-evacuated ,,
= 595
or on a population of a million, a difference of some 40,000 lives.
As regards-
(iii.) Evacuation shortens the duration of an epidemic.
Taking District by District, the average actual duration of epidemics in evacuated and
non-evacuated towns and villages is given below.* They are classified as follows:-
(a) Evacuated towns.
(b) Non-evacuateed towns.
(c) Evacuated villages.
(d) Non-evacuated villages.
In cases (b) and (d) are included also partially-evacuated towns and villages, so that the
figures for them obtain whatever benefit this measure may have bestowed. Bombay, Karchi,
Poona and Surat, also, on account of their size, have been omitted from the following
calculations.
For (a) and (b) the results are as follows: -
(a)
Number of epidemics in evacuated towns
= 12
Total aggregate duration of epidemics
= 184 weeks.
Average duration
= 15 1/3 weeks.
(b)

Number of epidemics in towns not evacuated
= 13
Total aggregate duration of epidemics
=266 weeks.
Average duration
=20 6/15 weeks.
Evacuation, therefore, would appear to shorten the duration of epidemics in towns
by one-quarter.
For (c) and (d), taking District by District, the results are as follows:-
1. Belgaum.

Villages evacuated = 15
Villages not evacuated = 13
(c)
Aggregate duration = 90 weeks.
(d)
Aggregate duration = 150 weeks.
Average duration = 6 weeks.
Average duration =11 7/13 weeks.
2. Cutch.

Villages evacuated = 8
Villages not evacuated = 24
(c)
Aggregate duration = 54 weeks.
(d)
Aggregate duration =262 weeks.
Average duration = 63/4 weeks.
Average duration -=10 11/12weeks.
3. Dhrwr

Villages evacuated = 22 /
Villages not evacuated = 18
(c)
Aggregate duration = 96 weeks
(d)
Aggregate duration = 203 weeks.
Average duration = 4 4/11weeks.
Average duration =11 5/18 weeks.
* Epidemics of under four weeks have been neglected. Only towns and villages in which evacuation was
begun within a month after the first case, and for which the figures are reliable, have been taken.