SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 95 



Summary of the Readings Taken on the Aunconquilcha Expedition. 



In order to obtain the value of the solar radiation at air-mass i, 

 a comparison of the slopes of the pyrheliometer at Montezuma, the 

 Mine Camp, and at Aunconquilcha was made. Owing to the sun's 

 declination, air-mass 1.39 was the lowest possible at this time of the 

 year. 



