508 OBSERVATIONS ON THE ZODIACAL LIGHT. 



No. 254. 



DECEMBER !3th, 1854: EVENING. 



Lat. 37 46' N.: Lon. 122 21' VV. 

 Sun set at 4/i. 33m. 



( 6h. 15m. ) 



Stronger Light at? 7 15 > Diffuse Light at C^. 15m. and 7fi. 15m. 

 (8 (I S 



Sky clear, and very brilliant. The Zodiacal Light quite bright at C' 1 15'. At 8' 1 15 m , dim, but distinctly 

 marked. Had some difficulty in getting outlines at that hour, but believe those in the chart may be relied on. The 

 Diffuse was about the same as at 7 h 15'". At 9' 1 , the Light could still be made out, and its upper end had evidently 

 ascended up as high as 6 and 8 Pisciurn, but I could not get reliable boundaries. The night, at that hour, was still 

 very brilliant, and favorable for observations. 



