608 



OBSERVATIONS ON THE ZODIACAL LIGHT. 



No. 304. 



MARCH 17th, 1855: MORNING. 



Let. 22 55' S.: Lon. 43 6' W. 

 Sun rose at 6/1. (im. 



( 3/i. lorn. 1 



Stronger Light at< 4 >Dift"use at 3A. 15m., &c. 

 (4 30 > 



Sky very favorable, and I watched all the changes of the Zodiacal Light from 3 o'clock till dawn. At 3" the 

 Light was yet dim, but gave reliable boundaries ; though, on the right, I was puzzled somewhat in getting them, as 

 they seemed to change. After a while I thought, suddenly, that the Light had dimmed considerably, and then came 

 to the conclusion that there were pulsations, not only in intensity of the whole, but also in the boundaries at the right. 

 Of these I began to take note, sometimes fully satisfied that there were pulsations, sometimes doubting and giving 

 up annotations of that kind. The following are my notes : 



h. m. 

 * * * 



At 3 20, bright, and at b. 



3 21^, dimming. 



3 23,, dim, and at a. 



3 25, brightening. 



3 26|, bright, and at b. 



3 29, still so. 



h. m. 



(An interval of doubting.) 

 * * * 



At 3 40, obviously dim, and at a. 

 3 42, brightening. 



3 43, decidedly brighter, and at b. 



3 48, very bright. 



4 6, still so. 



After 4" 6"', I could see nothing like pulsations. The brightness had now got to be very great, and I saw no 

 changes, till, by and by, it began to fade away, or rather to be merged in the dawn, which had come decidedly at 

 4" 48 m . 



