502 OBSERVATIONS ON THE ZODIACAL LIGHT. 



No. 251. 



DECEMBER 9th, 1854 : EVENINS. 



Lat. 38 2' N. : Lon. 122 7' \V. 

 Sun set at 4/i. 36. 



C 6h. 30m. 



Stronger and Diffuse Light at < 7 30 

 t 8 



Sky brilliant. The outlines of both Stronger and Diffuse Light were remarkably well marked at 6" 30 m ; also, at 

 7" 30 m , very distinct ; at 8 h , dimmed considerably, but outline still good ; at 8 h 30 ra , Light still distinct : boundaries 

 not easily made out, but seemingly as at 8 o'clock. 



