856 OBSERVATIONS ON THE ZODIACAL LIGHT, 



No. ITS. 



JULT 8th, 1854 : MORMNO. 



Lat. at 3A., 20 14' N.: Lon. 120 26' E. 

 Sun rose at 5A. ll|m. 



Stronger Light at | g*- .^"^ j D iffuse 3A. 



Sun's Lon. 105 C.V. 



The moon interfered, this morning, till 3 o'clock, when I was able to get an observation; the sky, though not bril- 

 liant, still very favorable. I have marked by the zigzag line the height to which the strongest part of the Stronger 

 Light appears to ascend, though it tapers off so gradually that it is difficult to draw a distinctive mark, while it is 

 evident that the Light below is much brighter than higher up. I thought several times that there were pulsations, 

 and on one occasion took notes thus : 3 !l 26 m , the brightest part dim and at a; 3 h 28, do.; 3 h 29"', brightening : 3" 

 32 m , at b, and brighter ; 3 1 ' 36 m , do. do. But I cannot present these annotations as reliable ; the changes, if there were 

 any, being so uncertain, although I watched with the greatest care. Soon after 3 h 36 m commenced a permanent gradual 

 brightening ; and at 3" 43 m dawn had come. 



