158 OBSERVATIONS ON THE ZODIACAL LIGHT. 



No. 79. 



NOVEMBER 1st, 1853 : MORNING. 



Lat. 22^ 23' N.: Lon. 113 32' E. 



Sun rose 6h. 8m. 



Stronger Light at 3li. Om. Diffuse-- at Ih. Om. 

 40 20 



4 30 30 



4 48 10 



4 30 

 4 48 

 Sun's longitude 219 6'. 



The atmosphere being remarkably favorable, I determined to rise so as to be able to watch for the first indications 

 of the Zodiacal Light, in the cast. Accordingly was on deck at 8 minutes before 1"; but the Zodiacal Light was be- 

 fore me. There was already, from Pnesepe down, a narrow strip of blush or faint Light. Distrustful of my own 



eyes, I got Lieutenant M (who had charge of the deck), to assist me with his judgment; and he agreed that 



there was a degree of light there, which the adjacent parts of the sky did not have. The boundaries are given in the 

 chart. 1 remained on deck till 2", and saw this faint tinge gradually increasing in strength, and widening its bor- 

 ders, till it became at 2' 1 as in the chart. Rose again at 3 h , and found the Stronger Light showing itself. From 4 h 

 to 4 h 30"', the Stronger Light was really splendid. It was as if the sun were going to rise there, in a minute or two. 

 At 4 h 30 m , it suddenly began to lose its brilliancy, and to sink clown very rapidly. Its limits, at 4 h 30 m and 4" 45 m , are 

 given in the chart. At 4' 1 50 m , the light broke bounds and spread laterally with great rapidity ; at 4" 52'", there were 

 -no boundaries, the eastern sky had all a general whiteness, and dawn bad arrived. 



