102 OBSERVATIONS ON TUB ZODIACAL LIG11T. 



No. 81. 

 NOVEMBER 2d, 1853 : MORNING. 



Lat. 220 93' N.: Lou. 113 32' E. 



Sun rose GA. 9>n. 



Stronger Light at O/i. 50m. Diffuse 4A. Om. 

 40 4 30 



4 27 

 4 41 

 4 49 

 Sun's longitude 220. 



Was on deck at midnight, to watch for the first indications of the Zodiacal Light. Prassepe was above the horizon, 

 but the sky below it was like every other part; watched closely, but could see nothing till half an hour past mid- 

 night, when 1 thought there was possibly a little tinge of white, but was doubtful; 12 h So" 1 , thought the tinge had 

 increased, but was still doubtful; 12" 40'", the light, pretty reliable as the Zodiacal Light. At 12" 50'", I called the 

 quartermaster on duty, and, pointing to a stretch of about 90 along the horizon, said: "Does any part of that sky 

 appear brighter to you than the rest?" He answered immediately, pointing to the portion below Prajsepe, " Yes, 

 sir, it is considerable brighter just here." Tlhis was also my own opinion. So between the disappearance of the 

 western, and the appearance of the eastern Zodiacal Light, in reliable forms, there was an interval of 80 minutes. 



For the rest, see the chart. At 4'' 25', the Stronger Light, suddenly sunk (in two minutes' time), and at 4 h 2'7 m , 

 was as in the chart, being also much diminished in brightness. At 4 h 40"', it widened rapidly below ; at 4 h 49 m , 

 was as in chart. At 4' 1 50"', the light broke bounds effectually, and spread over the sky; at 4 h 52'", dawn had fully 

 come. 



