G31 OBSERVATIONS ON THE ZODIACAL LIGHT. 



No. 317. 



APRIL llth, 1855: EVENING. 



Lat, at 8A, 15 9' N. : Lon. 48 56' W. 



Sun set at Gfi. 10m. 

 Stronger Light at 7/i. 25m. and 8h. 45;. : Diffuse at 7A. 25m. and 8h. 40m. 



Sky troubled with flying clouds, otherwise very good for observations. In consequence of the clouds, I could not 

 get reliable boundaries till 7 h 25 m , nor again till 8 1 ' 45 m . Could not make out reliably the upper extremity of the 

 Diffuse Light. At 10 h the Light was still distinct, but dim. 



Went on deck again at midnight. I thought there was a brightness at the west, at midnight, along the Zodiacal 

 Light course, but nothing certain could be made out. Tried a long time, as the sky was extremely favorable for 

 observations, and thought sometimes that I could get boundaries (nearly the same as at 8 h 40 m , but running higher 

 up); but finally came to the conclusion that both boundaries and the Light itself were all very uncertain. 



