626 OBSERVATIONS ON THB1 ZODIACAL LIGHT. 



No. 313. 



MARCH 29th, 1855: MORNING. 



Lat. at 4/i., 17 24' S. : Lon. 35 10' W. 

 Sun rose at G!>. 9m. 

 ( 3A. Om. 1 



Stronger Light at< 4 > Diffuse 3A. and 4/<. 

 ( 4 30 ) 



Was on deck at 3 o'clock, and found the sky clear and very good for observations. The left or northern bounda- 

 ries of the Zodiacal Light were well marked : on the right hand, or southward, the Stronger Light passed more 

 gradually into the Diffuse ; but still it gave very good boundaries. All those given at 3 b , 4", and 4 h 30 m , in the chart, 

 appeared to me to be fully reliable. At 4 h , found the sky still very favorable ; the Stronger Light bright and cone- 

 shaped. Thought I saw pulsations; but was too uncertain to record them, till 4 1 ' 16 m , when there seemed to be a 

 sudden and great dimming of the Stronger Light, and it then sunk down to the zigzag . At 4" 20 m , it had con- 

 tracted to b b, leaving of the Stronger Light only the small patch within that zigzag, greatly dimmed from what the 

 Light was at 4 h . My record then goes on: " 4" 25 m , still dim ; about 4 h 26 m , brighter ; 4" 27 m , dimmed ; 4" 29^"', 

 brighter, and has shot up once more into the cone shape ; 4 1 ' 38'", quite bright, still cone shaped, but brightest within 

 the zigzag a; 4 1 ' 43 m , very bright within the zigzag a ; 4 h 45 m , is breaking bounds and spreading at the horizon ; 4 1 ' 

 48 m , dawn has come." 



