556 



OBSERVATIONS ON THE ZODIACAL LIGHT. 



No. 278. 



JANUARY llth, 185. r >: Evtiunfi. 



Lat. 8 47' N. : Lon. 79 31' \V. 



Sim set at 5/i. 54m. 

 7A. 15m., &c., to ( 



Stronger Light at < 



Stars remarkably brilliant in a sky almost black; night extremely favorable for observations. At 7" 15'" the 

 effulgence below the zigzag very strong. Watched for pulsations ; sometimes doubted whether there were any at all ; 

 sometimes was certain that there were. My notes at the time were as follows : 



"At 7 24, 



7 26, 



34, 



7 28, 

 7 30^ 



7 32, 



7 

 7 

 7 

 7 

 7 

 7 

 7 



36, 

 37, 

 37! 

 39, 

 40, 



741, 



at b, and bright. 



exceedingly bright. 



still do. 



, has just dimmed decidedly, and at a. 



bright, and at ?>. 



very bright. 



, dimming. 



evidently dimmed. 



quite dim, and at a. 



, brightening. 



bright, and at b. 



quite bright. 



very bright. 



42, 

 43, 

 44, 

 7 45, 



7 id. 



do. 



still so, 

 do. 

 do. 

 do. 



and no mistake about it. 



h. in. 



* # # 



At 7 49, now quite bright. There seem still to be pul- 

 sations ; but they are so badly marked now, 

 that I cannot catch their periods. 



7 50, very bright. The effulgence below the zigzag 

 now much dimmer than at first. 



755, the light has almost suddenly extended to c. 



7 57, dimmed once more. 



7 58, quite dim. 



7 59, has brightened. 



0, has brightened considerably. 



1, quite bright. 



2, do. do. 



5, still very bright. 



8 

 8 

 8 

 8 

 8 

 8 



7, do. do., seems now to be permanent. 



10, still the same." 

 At 9 o'clock Zodiacal Light still well marked, and gave 

 reliable boundaries. 



