114 REPORT UNITED STATES ENTOMOLOGICAL COMMISSION. 
Table II— Average monthly temperature for 1864 and 1866. 
Mouths. 
January 
February 
M.u ■ 1 1 
April 
May 
June 
July , 
August 
September 
October 
Norember 
December 
Annual mean 
Minnesota. 
Iowa. 
1864. 
1866. 
1864. 
1866. 


o 
o 
11.4 
11.5 
17.0 
17.8 
22.5 
9.3 
26. 6 
18. 1 
27.0 
19.1 
32.6 
28.2 
41. 9 
42.8 
45.7 
49.6 
60.8 
56.8 
61.3 
58.3 
66.9 
65.2 
72.0 
67.6 
72. 3 
74.8 
75. 5 
76.4 
70.7 
65.5 
72.1 
67.4 
62.2 
55.5 
63.7 
57.2 
45.0 
47.9 
46.5 
51.4 
30.0 
33.6 
33. 1 
38.0 
1L3 
17.0 
17.5 
22.2 
43.58 
41. 58 , 47. 05 
40.01 
Nebraska. 
1864. 
17.4 
31.2 
34.0 
45.8 
6.1. 4 
74.3 
77.5 
74.6 
66.9 
45.7 
33.7 
19.9 
48.7 
1866. 
20.6 
24.5 
29.5 
51.4 
60.7 
68.3 
78.4 
72.6 
58.4 
51.8 
40.7 
24.6 
48.46 
Kansas. 
1864. 
25. 1 
39.6 
40.0 
51.3 
65.4 
76.9 
83.6 
80.2 
73.3 
50.5 
37.8 
28.1 
1866. 
27.7 
30.2 
38.7 
56.4 
73.1 
70.0 
77.2 
73.6 
61.5 
55.8 
42.4 
29.8 
Missouri. 
1864. 
24.4 
36.7 
40.8 
50.6 
66.6 
75.5 
80.2 
74.1 
68.3 
49.7 
39.8 
24.5 
54. 31 53. 03 52. 
1806 
29.5 
30.2 
39.7 
58.6 
62.6 
7L9 
79.4 
73.0 
61.6 
56.0 
44. 8 
32.4 
53. 31 
From this table we see that the average temperature of 1864 in each 
one of the States mentioned except Missouri, was slightly in excess of 
that of 1806, showing that the former year was somewhat warmer than 
the latter. A comparison of the monthly means, brings out no fact that 
would have a tendency to change the bearing of the annual means on 
the locust question. The months of April, October, November and 
December are the only ones in which the temperature of 1866 was gen- 
erally higher than that of 1864. 
Do the records of the raiufall for 1866 over the entire West correspond 
with what is shown in our first table ! In order to test this, we present 
here the ratios of this year in the different States and Territories in the 
same manner as heretofore "riven for 1864. 
Texas, 1.34. 
Tennessee, .96. 
Kentucky, 1.23, 1.09. 
Ohio, 1.11, 1.18, 1.11. 
Michigan, 1.05. 
Indiana, 1.31, .96, 1.33. 
Illinois, .88. 1.02, 1.13, 1.03, .91. 
Wisconsin, 1.19. 
Iowa, 1.00, 1.08, 1.03, 1.45, 
Missouri, .99, 1.36, 1.22. 
Kansas, 1.15, 1.52. 
California, 1.36, 1.57, 1.57. 
Utah, 1.60. 
Montana, 1.30. 
Nebraska, 1.03. 
Minnesota, 1.00, 1.08, .81 
91. 
Adding those ratios together and dividing by the number of stations 
represented, we obtain as the general average 1.16, showing that the 
rain precipitation over the "West in 1866 was about 16 per. cent more 
than the average annual amount. We are fully aware that in order to 
obtain strictly correct results on which to base calculations as to the ab- 
solute amount of rain precipitation, each station must be compared 
only with itself at different times ; but the method here adopted does 
give a correct idea of the character of the year in reference to humidity 
so far as meterological records will show it. In fact, we can obtain a 
general idea of a season over an extended area, from meterological 
records, in no other way. 
What do our investigations thus far show in reference to the years 
