&54 



OBSERVATIONS ON THE ZODIACAL LIGHT. 



No. 277. 



JANUARY 10th. 1855: EVENINO. 



Stronger Light at{ " 



Lat. 8 47' N. : Lon. 79 31' W. 

 Sun set at 5A. 53m. 

 11., &c., to 



Diffuse at 7h. 15m. and 8A. Om. 



Sky very brilliant, and everything favorable for observations, 

 record : 



Thought I saw pulsations, and made the following 



h. m. 



* * * 



'At 7 25, very bright, and at b. 

 7 27, dimming, at a. 

 7 28, dim do. 



7 31, brightened. 

 7 32, bright, at I. 

 7 33, decidedly dimmed, at a. 



(The dimming seems more rapid than the brightening.) 

 7 35, dim yet, and at a. 

 7 36, brightening. 

 7 37, bright, and at b. 

 7 38, quite bright, do. 

 7 40, still so. 

 7 41, do. 

 7 42, very bright now. 

 7 44^, still bright, and at b. 

 7 46, very bright, do. 

 7 48, dimmed somewhat. 



(There seemed now to be slight pulsations in bright- 

 ness, while the boundary continued permanent at b.) 



h. m. 



At 7 50, brightened. 

 7 51, quite bright. 



7 54, still bright. 

 57, do. 



0, considerably dimmed. 



5, brightened once more. 



6, quite bright. 



7, the upper part of the Zodiacal Light is now much 



brighter than before, and the lower part is 

 dimmed. 



8 10, lower part brightened again. 

 8 12, still so. 



8 17 ; it seems tobs permanent as at last bright be- 

 low, and tapering off; brightness very gradual 

 to the upper end ; the boundary as in the 

 chart at 8." 



7 

 8 

 8 

 8 

 8 



At 9 o'clock the Zodiacal Light was still very distinct, and with boundaries evidently much extended (so also last 

 night) ; but so dim, that it was difficult to get them reliably : but I made the attempt. 



