191 1.] BARNARD— SELF-LUMINOUS NIGHT HAZE. 253 



■ Note. 



Since this paper was in type Mr. C. F. Talman, Librarian of 

 the Weather Bureau at Washington, through Dr. W. J. Humphreys, 

 has called my attention to a paper, Xo. 22, of the Publications of the 

 Astronomical Laboratory at Gronitlgen. " On the Brightness of the 

 Sky and the Total Amount of Starlight " by L. Yntema. Dr. 

 Yntema calls attention to the frequent luminous condition of the 

 sky and its efifect on determinations of the amount of starlight. In 

 section 14 of his paper, which is devoted to earthlight. he gives 

 numerous records of this illumination. There does not appear to be 

 any direct reference, however, to the main features of my paper — the 

 luminous hazy strips and masses. 



]\Iay 15. 191 1. 



