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METEOROLOGICAL.

The appended meteorological tables have been kindly furnished, at the request of the Secretary, by Brevet Major-General W. B. Hazen, Chief Signal Officer of the Army.

They comprise statements of (1) mean barometer, reduced to sea level; (2) mean temperature; (3) mean relative humidity; (4) the precipitation, in inches and hundredths ; (5) the prevailing direction of winds; and (6) the total wind movement in miles. These have been compiled from the observations made at the stations in Chicago, Springfield and Cairo, Ill., St. Louis, Mo., Dubuque and Keokuk, Iowa, Indianapolis, Ind., and Louisville, Ky., from the date of establishment of each station, respectively, down to the close of December, 1881. These eight stations, it will be seen, sufficiently cover the whole area of Illinois to enable a tolerably accurate estimate to be made of the meteorological conditions of any given section of the State.

In a problem of such complexity as the relations between disease variation and variation of meteorological elements, no contribution is to be overlooked ; and the student in this branch of etiology has, in the tables here furnished, a mass of data which may be turned to good account in the future.

It is to be hoped that the BOARD may soon be in a position to make available the proffer of the Signal Service Bureau, to furnish a portion of the necessary equipment for a large number of meteorological stations throughout the State.

MEAN BAROMETER-REDUCED TO SEA LEVEL.

CAIRO, ILL.

Year.

Jan. Feb. Mar. Apr. May. June July. Aug. Sept. Oct. Nov. Dec.

1871.. 1872 1873. 1874. 1875. 1876. 1877. 1878. 1879. 1880. 1881

30.140 30.122 30.130 30.230 30.270 30.063 30.150 30.049 30.054 30.042 30.028 30.079 30.061 30.156 30.190 30.294 30.165 30.130 30.070 30.033 29 980 29.980 30.002 29.974 30.046 30.149 30.165 30.226 30.260 30.177 30.028 30.016 29.973 30.003 29.996 29.999 30.074 30.086 30.072 30.012 30.201 30.151 30.037 30 019 30.000 29.941 30.005 30 022 30.010 30.041 30.071 30.190 30.217 30.200 30.054 29 896 29.997 29.960 29.995 29.993 30.033 30.039 30.110 30.155 30.097 29.978 29.967 29.798 29.956 29.949 29.969 29.924 30.022 30.044 30.072 30.188 30.254 30.200 30,149 30.026 30.018 30.027 29.989 29.997 30.138 30.172 30.180 30 160 30.120 30.145 30.115 30.022 30.028 30.030 30.047 30.038 30.112 30.140 30.292 30.216 30.224 30.151 29.937 30.027 30.014 29.970,30.049 30.009 30.050 30.148 30.214 30.224

MEAN BAROMETER-REDUCED TO SEA LEVEL.

CHICAGO, ILL.

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30.132 30.099 30.099
9.978 29.951 29. 30.030 29.912 30

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30.009 30.012 30.008 30.026 29.990 30.100
30.093 30.101 30.033 30. 29.957 29.901 29.939 29.953 29.991 30. 30.023 30.097
30.214 30.098 29.927 29.959 29.905 29.934 29.929 29.926 29.999 29.950 30.041 29.886
30.038 30.030 29.980 29.950 29.939 29.832 29 941 29.978 29.957 29 906 29.960 30.078
30.118 30.145 30.022 29.927 29 984 29.865 29.911 29.910 29.969 29.946|30.005 30.054
30.004 29.913 29.890 29.741 29.894 29 991 29.923 29.855 30.003 29.967 30.003 30.048
30.117 30.083 30.044 29.976 29.999 29.955 29.913 29.928 30.048 30.086 30.048 30.069
30.001 30.028 30.057 29 910 29.940 29.912 29.936 29.970 30.007 30.030 30.167 30.103
30.135 30.103 29.869 29.994 29.988 29.906 29.993 30.007 29.954 30.098 30.090 30.130

MEAN BAROMETER-REDUCED TO SEA LEVEL.

DUBUQUE, IOWA.

Year.

Jan. Feb. Mar. April May. June July. Aug. Sept. Oct. Nov. Dec.

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29.967 30.016 29.983 30.016 30.009 30.086
30.193 30.106 30.043 30.138 29.937 29.910 29.923 29.970 30.004 30.085 30.073 30.145
30 280 30.163 29.994 988 29.909 29.932 29.939 29 975 30.008 29.965 30.068 29.908
30.044 30.044 30 005 29.929 29.918 29.814 29.933 29.961 29.971 29.903 30.006 30.148
30.155 30.169 30.055 29.937 29.945 29.847 29.904 29.921 29.947 29.972 30.040 30.062
30.043 29.945 29.885 29.716 29.873 29.881 29.925 29.867 29.99829.963 30.032 30.111
30.149 30.129 30.064 29.984 29.958 29.917 29.899 29.920 30.047 30.068 30.048 30.00
29.999 30.001 30.048 29.893 29.899 29.884 29.929 29.960 30.071 30.018 30.162 30.140
30.174 30.125 29.924 30.000 29.960 29.893 29.997 30.000 29.923 30.081 30.094 30.154

MEAN BAROMETER-REDUCED TO SEA LEVEL.

INDIANAPOLIS, IND.

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30.105 30.053 30.065 30.111
30.130 30.008 30.043 29.960 29.988 29.976 29.964 30.032 29.997 30.093 30.112 30.218

MEAN BAROMETER-REDUCED TO SEA LEVEL.

KEOKUK, IOWA.

Year.

Jan. Feb. Mar. April May. June July. Aug. Sept. Oct. Nov. Dec.

1871. 1872 1873. 1874. 1875. 1876. 1877. 1878. 1879 1880 1881

30.087 29.979 30.039 30.095 30.117 29.964 30.035 29.904 29.906 29.883 29.892 29.945 29.906 30.017 30.065 30.221 30.032 30.044 0.01029.864 29.863 29.877 29 904 29. 966 29.990 30.039 29 998 30.101 30.104 30.090 30.039 30.009 29.892 29.880 29.909 29.903 29.976 30.068 30.067 30.139 30.243 30.118 29.966 29 940 29.835 29 881 29 895 29.904 30.000 29.967 30.041 29.908 30.071 30.041 29.966 29.919 29.893 29.811 29.909 29.930 29.936 29.915 30.002 30.141 30.142 30.159 30.014 29.861 29.913 29.806 29.889 29.908 29.949 29.946 30.026 30.066 30.019 29.905 29.856 29.714 29.856 29.856 29.876 29.846 29.982 29.968 30.009 30.123 30.160 30.093 30.056 29.942 29.902 29.888 29.867 29.887 30.022 30.056 30.025 30.058 29 956 29.984 34.010 29 871 29.873 29.859 29.904 29.910 29.987 30.016 30.180 30.155 30.183 30.109 29.917 30.000 29.941 29.866 30.006 29.974 29.929 30.072 30.117 30.152

MEAN BAROMETER-REDUCED TO SEA LEVEL.

LOUISVILLE, KY.

Year.

1871.. 1872. 1873. 1874. 1875. 1876. 1877. 1878. 1879 1880. 1881

Jan. Feb. Mar. April May June July Aug. Sep. Oct. Nov. Dec.

30.106 30.057 30.145
30.099 30.013 30.087 39 905 39.849 23.931

30.009 30.082 30.115 30.205
30.160 30.110 30.060 30.014 29.951 29.939
30.230 30.152 30.013 30.003 29.920 29.972 29.964 29.968 30.044 30.042 30.026 29.980
30.163 30.111 30.009 30.003 29.986 29.912 29 981 30.011 29.968 30.010 30.012 30.129
30.179 30.168 30.018 29 900 30 000 29.940 29.945 29 937 29.999 30.000 30.059 30.123
30.042 29.926 29.937 29.767 29.919 29.903 29.912 29 889 30.071 30.064 30.039 30 109

029 20:30.026

30.110 30.144 30.184 30 189 30.144 30.101 29.987129.997 29.987 29.950 29.962 30.098 30.139 30.145|30.121 30.069 30.080 30.063 29.986 30.002 29.980 29.984 29.991 30.052 30.079 30.221 30. 137 30.143 30.110 29.851 29.968 29.972 29.915 28.987 29.973 30.021 30. 113 30.173 30.160

MEAN BAROMETER-REDUCED TO SEA LEVEL.

ST. LOUIS, MO.

Year.

Jan. Feb. Mar. April May. June July Aug. Sept. Oct. Nov. Dec.

30.099 30.041 30.065 30.090 30.160 30.010 30.057 29.947 29.960 29 919 29.918 30.006 29.965 30.075 30.104 30.232

30.148 30.125 30.079 30.016 29.955 29.955 29.980 29.969 30.029 30.127 30.141 30 205
30.280 30.175 30.021 30.006 29.954 29.962 29.965 29.983 30.060 30.041 30.078 29.964

1871. 1872. 1873.. 1874. 1875. 1876. 1877. 1878. 1879. 1880. 1881.

30.198 30-200 30.048 29.895 22975 29.911 29.959 29.961 39.004 30.000 30.083 30.110
30.057 29.948 29.923 29.759 29.923 29.914 29.933 29.917 30.061 30.047 30.048 30.174
30.212 30.163 30.111 29.996 29.974 29.961 29.941 29.93.colo! 30.108 30.111
30.054 30.073 29.959 20.965 29.962 29.982 29.939

30.243 30.166
30.191 30.110 29.901 29.997 29.965 29.924 30.024 30.000 29.997 30.134 30.184 30.199

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Year.

Jan. Feb. Mar. April May. June July. Aug. Sept. Oct, Nov. Dec

1879 1880. 1881

29.968 29.963 30.094 30.129 30.100 30.118 30.043 30.066 30.119 29.953 29.971 29.952 29.974 29.988 30.061 30.083 30.234 30.170 30.191 30.121 29.910 30.012 29.976 29.919 50.022 30.010 29.984 30.116 30.158 30.186

MEAN TEMPERATURE.

CAIRO, ILL.

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Feb. Mar. April May June July. Aug. Sept. Oct. Nov.Dec.

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MEAN TEMPERATURE.

DUBUQUE, IOWA.
Jan. Feb. Mar. April May. June July. Aug. Sept. Oct. Nov. Dec.

Year.

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Year.

Jan. Feb. Mar. April May June July. Aug. Sept. Oot. Nov. Dec

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