REPORT OP THE ACTING SECRETARY. 41 



The Smithsonian party, in charge of Mr. C. G. Abbot, and 



equipped with the necessary apparatus, reached Mount Wilson in 

 May and remained there until the latter part of October, 1905. The 

 weather conditions remained excellent throughout most of the season, 

 permitting the work to go on uninterruptedly. Again, in May, 1906, 

 Mr. Abbot returned to Mount Wilson, where his observations are 

 expected to continue over a somewhat longer period. 



Sufficient material has been assembled since the publication of the 

 first volume of the Annals of the Astrophysical Observatory to war- 

 rant the issuing of a second volume, the preparation of which is now 

 in progress. 



Respectfully submitted. 



Richard Rathbun, 

 Acting Secretary of the Smithsonian Institution^ 



