19 
PREVALENCE. 
The following table shows the cases according to dates of definite 
onset : 
Day of month. 
May. 
! , June. 
July. 
August. 
September. 
1 October. 
l.._ - _ _ _ - . 
2 
0 
0 
11 
5 
5 
9! 
1 
0 
1 
.5 
5 
8 
3 
2 
0 
1 
6 
3 
3 
i 
1 
1 
2 
6 
5 
3 
5 - - _ - — 
2 
2 
3 
7 
3 
2 
6 
0 
0 
3 
2 
4 
2 
r 
0 
1 
3 
6 
4 
3 
8 
0 
1 
3 
9 
1 
2 
9 .. 
1 
2 
5 
4 
2 
2 
10 
3 
2 
6 
' 7 
11 
6 
11 
0 
1 
2 
4 
1 
1 
12 _ _ . 
' 1 
2 
3 
8 
2 
2 
13 
0 
3 
2 
11 
3 
4 
14 
1 ^ 
0 
2 
6 
2 
3 
15 - _ _ .. 
0 
0 
3 
! 7 
3 
6 
16 
1 
2 
2 
' 3 
2 
3 
17 L_r 
1 
2 
2 
5 
4 
3 
18 
0 
1 
3 
10 
4 
0 
19 
1 
0 
4 
2 
5 
0 
20 
1 
3 
5 
! 5 
8 
7 
21 -- 
0 
1 
3 
5 
4 
2 
•79 
0 
0 
1 
5 
3 
1 
23 . 
0 
2 
7 
1 
1 
0 
24 
0 
2 
1 
3 
1 
1 
25 _ - - - 
1 
3 
7 
6 
6 
0 
26 
1 
3 
3 
2 
1 ' 
0 
27 _ - _ - _ . 
2 
3 
7 
7 
4 
0 
28__ 
0 
2 
7 
5 
6 
0 
29 
3 
2 
7 
5 
2 
0 
30 - 
1 
1 
1 
2 
3 
0 
.^1 
0 
3 
1 
0 
As in our previous report, the cases are tabulated and charted ac- 
cording to date of onset of definite stunptoms, it having been found 
again that in the majority of instances accurate statements as to date 
of onset of the first slight symptoms could not be obtained. 
The following table shows the progress of the disease as indicated 
dates oi onset of the cases in periods of a half month. The num- 
ber of cases for corresponding periods in 1906 are placed in a parallel 
column : 
Periods. 
Cases. 
1907. 
1906. 
Pebmary 1 to 15, ineompiete 
1 
April 1 to l.'i, inoomplpfp 
1 
April 16 tn .30, inpmnplptp 
7 
May 1 to 15, complete.. .. .. 
15 
