128 OBSERVATIONS ON THE ZODIACAL LIGHT. 



No. 64. 



OCTOBER 3d, 1S53 : MOBXIXG. 



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



Sun rose .">// .Vi.Jm. 



Stronger Light at 3h. Om. Diffuse at 2A. Om. 

 40 30 



4 30 40 



Went on deck at 2 a. m. ; and found the Zodiacal Light, though not bright, still quite decided. Lieutenant M 

 then the watch officer, was also able to make- it out. In the neighborhood of Pnvsepe, its brightness was then equal 

 to that of the Milky Way between Sirius and 26 of Monoceros. At 3 o'clock, the Diffuse Light at 1C Cancri was 

 equal to the same. At 4", the Stronger Light was very brilliant, its outline as in the chart; but immediately after 

 this, it began to sink rapidly, and at 4 h 30 m , it had got d.iwn to the limits given also in the chart. I was not looking 

 for this sudden change, but it was in accordance with observations on previous occasions. This Light, alter it had 

 sunk down, was also much dimmer than at 4 1 ' ; at 4" 37 1 ", there was a sudden and rapid spread of light beyond the 

 Zodiacal Light bounds, and dawn had come. 



