434 
Mosquitoes and Malaria 
TABLE G. 
Case (iii), a = 24000. 
TABLE H. 
Case (iv), a = 0. 
JMoDins 
1st Y63/r 
2nd Year 
3ra Year 
X6a>r 
xBi xear 
^na leai 
ora xear 
427 "0 
94-8 
27-3 
8*8 
396-9 
24-8 
1 '6 
369-8 
85-0 
24-7 
8-1 
315-0 
19-7 
3 
320-8 
76-2 
22-4 
250-0 
15-6 
h 
279-8 
68-5 
20-3 
198-4 
12-4 
5 
245-3 
61-6 
18-5 
157-5 
9-8 
6 
215-8 
55-5 
16-8 
125-0 
7-8 
190-6 
50-0 
15-3 
99-2 
6-2 
8 
168-8 
45-2 
13-9 
78-7 
4-9 
9 
149-9 
40-8 
12-7 
62-5 
3-9 
10 
132-9 
36-8 
11-6 
49-6 
3-1 
11 
118-5 
33-3 
10-5 
39-4 
2-5 
12 
105-9 
30-1 
9-6 
31-3 
1-9 
This example serves to show the effect (i) of leaving the mosquitoes alone, 
(ii) of destroying half, (iii) of destroying three-quarters of the mosquitoes, 
(iv) of exterminating them (but see Note on p. 431); the comparison is best seen 
by means of the curves in Diagram V. 
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 
Months. 
Diagram V. Curves illustrating Example 2. 
A. Case (i). B. Case (ii). C. Case (iii). D. Case (iv). 
