92 MiTNTJAL EEPORT SMITHSONIAN INSTITUTION, 1919. 



new method is independent of the variability of atmospheric trans- 

 parency, and (2), that it requires only about one-fifth as much time 

 as the old. 

 Respectfully submitted. 



C. G. Abbot, 

 Director^ Astrophy steal Observatory. 

 Dr. C. D. Walcott, 

 Secretary, SmitTisonian Institution. 



