PLAQUE CASES PER DAY
PLAGUE AND ATMOSPHERIC HUMIDITY.-March, 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
76
74
72
70
68
66
64
62
60
58
* * * * * * * * 8 * * * * * * * **:*****
96
94
92
90
88
86
84
82
80
78
RELATIVE HUMIDITY OF ATMOSPHERE PER CENT
56
54
52
50
48
46
44
42
40
50
48
46
44
42
40
38
36
34
30
28
26
24
22
20
18
16
14
12
10
8
2
0
DATE. 1 2
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
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