572 OBSERVATIONS ON THE ZODIACAL LIGHT. 



No. 286. 



JANUARY 22d, 1855: MORNING. 



Lat. at 4A., 12 46' S. : Lon. 79 23' W. 

 Sun rose at oh, 53m. 

 C '2/>. Om. 1 



Stronger Light at? 3 > Diffuse at 3A. and 4/i. 30m. 

 ( 4 30 ) 



21st was Sunday. Was on deck at 1" 45 m , and found the Zodiacal Light very distinct and well marked ; passing 

 clouds prevented my getting houndaries till 2 o'clock, at which time the sky was extremely favorable : so it con- 

 tinued till daybreak. At 2 h there was already a more effulgent part, which I have marked by the zigzag w. At 3'' 

 the effulgence was down to x, and'was very strong ; sky remarkably fine for observations. No dew. On deck 

 again at 4" 15 m , and now had some difficulty in making out the southern boundaries of the Stronger Light, which 

 I had not experienced before. The Light there passed off almost insensibly into the Diffuse Light. Still, I was 

 able to get what I think are reliable results. At 4" 20 the boundary of the effulgent part had got down to y, and 

 the effulgence was less brilliant; "5" 35 m , the light is spreading, giving signs of dawn; spreads fastest on the 

 southern side ; 4 h 40 m , dawn has come." At 4" 40 m there were still faint traces of the Zodiacal Light at its upper 

 end, dawn not having reached there yet. 



