428 
Mosquitoes and Malaria 
Numher of Infected Persons. 
Diagram II.* Stable Population Curve, Part 2. 
The direct relation between m and a (these symbols denoting corresponding 
values for a stable population) may be investigated as follows : 
When n ^ 1, we have (p. 424) 
(1 - r)« = -7937, 
.-. log, (l-r) = ^^ log, 7937 
■28104 
or 1 — r = e " . 
Now for a stable population 
_ 1 _ 1 
also 
I92p' 
I ^ 2.310i X 192p 
1 + - — — = e am 
p m 
* See p. 429 for the construction of this curve. 
