462 
Mr. Wilson’s Account of a mojl 
EXPERIMENT VI. 
We next went up to the leads of the Eaft wing of the 
Obfervatory. Here we hung a thermometer to the hook 
of a long pole, and raifed it in the air about twenty-four 
feet from the ground, and at the fame time inclined the 
pole over the balluftrade, fo as to put the inftrument fully 
to windward of the houfe. 
Upon fuddenly lowering the pole, after half an hour, 
and examining the thermometer, the air at that eleva- 
tion was found to be pretty conftantly 4 0 warmer than 
at the ftation below. 
EXPERIMENT VII. 
I 
The refult of this trial appeared more remarkable 
than any thing which had hitherto occurred. We 
lowered the pole till the thermometer was brought down 
within half a foot of the balluftrade, but keeping it ftill 
a few inches to windward of the building, and by this 
means it was found that the air here was never colder 
than + 1 o°. Upon the balluftrade there happened to be 
I feveral 
