SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOLUME 66, NUMBER 5 



Mobokins jfunb 



ON THE DISTRIBUTION OF RADIATION OVER 



THE SUN'S DISK AND NEW EVIDENCES 



OF THE SOLAR VARIABILITY 



(With One Plate) 



BY 



C. G. ABBOT, F. E. FOWLE, and L. B. ALDRICH 



(Publication 2412) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



MAY, 1916 



