136 OBSERVATIONS ON THE "ZODIACAL LIGHT. 



No. 68.- 



OCTOBER 18th, 1S53 : EVENING. 



Lat. 22? 11' X. : Lon. 113 36' E. 



Sun set 5A. 2:iw. 

 Diffuse Light at C/i. 40m. 



Clouds iiniformly since my last entry (Sth instant), except the evening of the 15th, when the moon interfered. 

 This evening had a clear western sky. Watched to see if I could discern when the twilight changed into the Zodiacal 

 Light. Could not tell. The position of the ecliptic is, however, unfavorable for this. The western sky, alter sun- 

 set, continued red for a considerable time ; this redness at last contracted its dimensions, first vertically, then hori- 

 zontally ; gradually the red grew dim, and changed by imperceptible degrees to a white light, the white expanding. 

 At G 1 ' 30'", I "knew I was looking at the Zodiacal Light; but it was impossible to say exactly when it had become so. 

 The moon, after 6" 40 ra , prevented further observations. 



