020 OBSERVATIONS ON THE ZODIACAL Lin I! 1 ?. 



No. 310. 



MARCH 24th, 1855: MORNING. 



Lat. 22 55' S.: Lou. 43 6' W. 

 Sun rose at 6/1. Win. 



f 3A. dm. 



Stronger and Diffuse Light nt< 4 

 ( 4 30 



Was on deck at 3 a. in., and found the sky very favorable for observations. The Zodiacal Light was dim, but gave 

 good outlines. About 3 h 10, the Stronger Light had increased considerably, with a more effulgent portion at its 

 central part, along the line of the ecliptic. 



Again on deck at 4 h ; and as the morning was in every respect remarkably favorable, except the radiance of 

 Jupiter, I watched carefully and long to see whether there would be pulsations. The Stronger Light was very bril- 

 liant, and continued so, till at 4' 1 13 m , I noticed that it had suddenly dimmed very much, with its lateral borders con- 

 tracted. At 4 h 20 m , it had spread again, and had brightened once more. At 4 h 21 m , it was very bright. I thought 

 at the time that there could be no uncertainty about these changes. I did not notice any others. Dawn about 

 4 h 48'". 



