DATE. 1
100
98
96
94
92
90
A
PLAGUE AND ATMOSPHERIC HUMIDITY.— May, 1903.
: 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
64
62
60
58
54
28 * * 8 * 2 * * 2 * * * * = * * * * * *
88
86
84
82
80
78
76
74
72
70
68
66
56
52
50
RELATIVE HUMIDITY OF ATMOSPHERE PER CENT
48
46
44
42
40
50
48
46
44
42
40
38
36
84
32
80
28
26
24
* 2 * * * N
22
20
PLAQUE CASES PER DAY
18
16
14
12
10
8
6
4
2
0
DATE. 1 2 3 4
!
5
6
N
8 9 10 11 12 13 14│15|16|17|18|1920|21|22|23|21|23|26 27 28 29 30 31
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