610 OBSERVATIONS ON THE ZODIACAL LIGHT. 



No. 305. 



MA.RCH 17th, 1655 : EVESINO. 



Lat. 22 55' S. : Lon, 43 6' W. 

 Sun set at 6A. llm. 



( ?A. 30m. 1 



Stronger Light at? 8 > Diffuse at 7A. 30m. and 8h. 

 ( 8 30 ) 



The sky clear, and night very favorable for observations. Watched most carefully every change of the Zodiacal 

 Light ; for these changes were remarkably distinct, and, owing to the rapid change of angularity between the ecliptic 

 and horizon, were very rapid. The Stronger Light was well marked at 7 h 20 m , but I could not get reliable bounda- 

 ries till tea minutes afterwards. J thought sometimes that there were pulsations, and made the following record: 



h. in. 



At 7 51, brightened, and at b. 

 7 52, very bright. 



Ji. in. 

 At 7 40, very bright. 



7 43, still bright, and at b. 

 7 45, dim, and at a. 



After 7 1 ' 52 m it grew dimmer, and at 8 1 ' 10'" had dimmed considerably. At S' 1 30 it was still distinctly marked in 

 the sky, but the Stronger passed so gradually into the Diffuse, that it was difficult to say where its boundaries were. 

 At 9 h the Zodiacal Light was still clearly innrkod on the sky, but no reliable boundaries could be got. 



