386 OBSERVATIONS ON THE ZODIACAL LIGHT. 



No. 193. 



JULY 31st, 1854 : MORNINO. 



Lat. at 34., 19 29' N. : Lon. 116 22' E. 



Sun rose at 54. 39m. 



Stronger and Diffuse Light at 3 and 4 o'clock. 

 Sun's Lon. 137 53'. 



The 30th was Sunday. Was not waked till 3 o'clock this morning ; found the sky very clear and bright. No 

 muddiness in the Zodiacal Light. Took boundaries very carefully ; those of the Stronger Light very distinct; of the 

 Diffuse Light, the limits were very badly marked ; and the Light itself was scarcely discernible, except near the Stronger 

 Light. I give its boundaries as they seemed to be, though perhaps they are not fully reliable. The boundaries 

 at 4 b seemed to be the same as at 3 o'clock. In these morning observations I am troubled, while getting the bound- 

 aries of the Stronger Light, by wbat seems to be a rapid varying of the bounds, which can be occasioned only by 

 pulsations ; and I strongly suspect that there are such pulsations, but I am not able to catch them reliably. This 

 morning I was too weak, from sickness,* to observe for them long. 



*This eicknees, which lasted six months, and is occasionally noticed in these annotations, was not occasioned by exposure in these observations, but by tho 

 sun, in my recent visit to Formosa, whither I was sent by the Commodore to make explorations for coal. 



