598 APPENDIX. 



ing more attentively, 1 could see a very pale yellow 

 arch rising from the same mass, and extending southerly 

 to S.E. by S., at an angle of 30°. Afterwards, several 

 detached radial clouds became visible, and more than 

 once I thought they differed much in brightness in the 

 same point. 



On first seeing the needle move, it occurred to me 

 that, though distant from it fifteen inches, the steel in 

 the works of the two chronometers might possibly be 

 the cause; but on my remaining motionless for ten 

 minutes, it went through the vibrations mentioned 

 above. 



At noon it was still considerably agitated, but steadily, 

 not jerking, and with the most gentle motion it went 

 from 1° 0' E., to 0° 20' W., and settled at 0° 0'. There 

 were now many more clouds of the same pale white 

 filmy form ; the whole of them coming from the same 

 mass at W. N. W., while the wind, it may be remarked, 

 was E. b. S. 



Not being satisfied respecting the chronometers, I 

 left them, together with my braces (which had a small 

 polished buckle on each), in my tent, and at l h p. m. 

 found the needle tolerably steady at 0° 10' E. ; but 

 while I was looking, it moved to 0° 30' E., to 0° 10' E., 

 to 0° 0', and I left it at 0° 30' E. 



The weather was fine, the sun less bright than in the 

 earlier part of the day, and the white clouds had become 

 of a more yellowish tint, and diffused in three arches 

 not unlike a common form of exhausted aurora, or that 

 appearance it assumes sometimes after very rapid motion. 

 At 2 h p.m., having the chronometers on as usual, I 

 found the needle steady at 0° 18' E. The sun was less 

 clear, and the thermometer descending. Clouds white, 

 generally diffused. 



