REPORT OF THE SECRETARY. 95 



has been completed and prepared for publication by Mr. Fowle. In 

 expeditions to Mount Wilson the observation of the amount and 

 distribution of solar radiation has been continued. In cooperation 

 with the new station above mentioned it is hoped to obtain much 

 more complete records of the variation of the sun, now shown by- 

 Clayton to be of great meteorological significance. 

 Eespectfully submitted. 



C. G. Abbot, 

 Director Astrophysical Observatory. 

 Dr. Charles D. Walcott, 



/Secretary of the Smithsonian Institution, 



