830 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 79 



CHICAGO. UNITED STATES 



Lat. 41° 53' N. Long. 87° 37' W. Hb = 823 ft. 



PRESSURE AT STATION: COR. TO 32° F. AND TO GRAV. AT 45° LAT. 



Means of two observations daily cor. to mean of 24 hours 



28 inches + 



M'ns 1.174 1.172 1.132 1.101 1.085 1.091 1.115 1.128 1.166 1.161 1.162 1.164 1.138 



