T
PLAGUE CASES PER DAY
RELATIVE HUMIDITY OF ATMOSPHERE PER CENT
PLAGUE AND ATMOSPHERIC HUMIDITY.- February, 1903.
DATE. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
100
98
96
94
90
88
86
84
82
80
78
76
74
72
70
68
66
64
62
60
58
56
54
52
50
48
46
44
* * * * = = = * * * * * * * 0 * * * * 0 * ***** ***=
92
42
40
50
48
46
44
42
40
38
36
$4
32
30
28
26
24
22
20
18
16
14
12
10
8
缎
A
DATE. I 2 3 4 5 6 7 8
9 10 11 12 13 14│15|16|17|18|19|20|21|22|28|24|25|26|27|28|29|30|31|