OBSERVATIONS ON THE ZODIACAL LIGHT. 



NO. m. 



JULY 7th, 1854: MOUSING. 



Lat. At 3*., 28 56' N.: Lon. 127 52' E. 

 Sun rose at 5A. ll.Jm. 



Stronger Light at j '' j"'"' | Diffuse 3A. 

 Sun's Lon. 104 58'. 



Was not waked till 2 h 30 m : found the sky very brilliant, but broken by flying clouds. Between these, however, I 

 was able, finally, to get complete boundaries both of the Stronger and Diffuse Light. At 3 h , was driven below by a rain 

 squall. This passed, and then had a good observation at 3 h 15 m . 1 am particularly careful now about the bounda- 

 ries, on account of the unusual course of the Zodiacal Light for which see the chart. The observation at 3 h 15 m , 

 and also the boundaries of the Diffuse Light, I think may be considered fully reliable. Was somewhat puzzled, this 

 morning, by what seemed to be rapid changes in the width of the Stronger Light at its lower and mere decidedly 

 marked end, and suspect that they were pulsations; but though the sky was very brilliant, I had no opportunity 

 to decide on this matter. At 3'' 25" 1 a heavy rain squall came up, and the sky was immediately all covered over 

 with clouds. 



