234 OBSERVATIONS ON THE ZODIACAL LIGHT. 



No. IIT. 

 FEBRUARY 15th, 1854: EVENING. 



Lat. 35 19' N. : Lnn. 139 43' E. 

 Sun set 5/i. 33m. 



Stronger Light j ^'" j' 1 " 1 ' I Diffuse 7fc. 



This was a very fine evening ; sky remarkably clear and good, except a sUeak of whiteness along the horizon, 

 which, however, did not interfere materially with the Zodiacal Light. I watched for the first appearance of this 

 Light. At G' 1 30 m j the western sky. above, was one uniform color ; G' 1 45'", the Zodiacal Light became dimly 

 apparent rather suddenly so but no clearly definite bounds ; G 1 ' 4*7'", quite decided up to the Pleiades ; could have 

 got bounds, but preferred waiting till they should be more decidedly marked ; G h 50"', Stronger Light now showing 

 itself, but no reliable boundaries to it ; at 7 h , and at 7" 10"', got boundaries. At this time the Stronger Light was 

 bright ; had some suspicions of pulsations from a to b (see chart), but was not certain ; could not watch with that 

 care that such delicate observations require, as I was anxious to catch the first appearance of the moon's Zodiacal 

 Light, now expected soon to appear ; so I turned from the western to the eastern horizon. 



Observation. " There is a regular paleness of the sky from Eegulus, up by Prrcsepe, &c., to the Milky Way, and 

 about 8 wide ; its centre nearly or quite on the ecliptic. It amounts almost, if not quite, to a positive light, and 

 seems like a dim branch of the Milky Way, that has strayed off from the general course." My Nofc*. 



