860 SMITHSONIAN MISCF.LLANROUS COLLECTIONS VOL. 79 



HELENA, UNITED STATE8 



Lat. 46° 34' N. Long. 112° 4' W. H„ = 4,110 ft. 



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



Means of two observations daily cor. to mean of 24 hoiu's 



25 inches + 



M'ns .758 .768 .739 .750 .750 .774 .834 .836 .826 .832 .818 .791 .790 



