40 1 



eBSBRVATIONS ON THE 2ODIACAL LIGHT. 



No. 202. 



AUGUST 22d, 1854 : EVENING. 



Lat. at eh., 15 45' N.: Lon. 116 36' E. 



Sun set 6A. ]6m. 

 Strougcr Light at 1h. 30m., &c., to 9h. : Diffuse 7A. 30m. and 8h. 30m. 



Evening very bright and clear, and favorable for observations. At 7 h SO, got boundaries as at a a strongest 

 below the zigzag line. The Light began to show itself somewhat suddenly at about 7" 20, but did not give reliable 

 boundaries till at the time noted above. After 7" SCP, I was watching the Light not, however, in the slightest 

 degree expecting pulsations, the ecliptic being then low towards the horizon when I began to suspect that there 

 were sudden changes, both in the intensity and limits of the Stronger Light, especially in the former. I soon became 

 so well satisfied of such pulsations, that I began to take notes of the succeeding ones, which are as follows : 



h. m. 



h. m. 



* # * # 



At 7 52^, dim boundary as at a a. 

 7 53, brightening. 

 7 54-5, bright boundary as at b b. 

 7 5fi, dimming. 

 7 57, quite dim, boundary as at a a. 



(There is no mistake on the subject.) 

 7 53, brightening. 

 7 59, do. slowly. 



At 8 h 30, still at b b; still tolerably bright, 

 longer be made out in a reliable manner, 



o 



a 



a " 



05 - 





At 8 

 8 



8 6 

 8 8 

 8 10 



0, tolerably bright. 



Si, there still seem to be pulsations ; but they are 



so slight, I cannot get them confidently. 

 6, bright, and at b b. 

 8^, do. do. 



do. do. 



Seemed to continue permanent in this bright- 

 ness, and at b b. 



At 9", the Light still observable, but the boundaries could no 



