c m 3 
Mr. Ronayne having received the following Letter 
from Mr. Henly, which corroborates and con- 
firms the obfervations mentioned in his paper, 
it was thought proper to print them together 
in this volume. 
October 16, 1771, | paft 5, P. M. 
I Find a fog (not very thick), foon after its ap- 
pearance, ftrongly electrical. The balls open 
i or | inch A, [See Tab. VIII.], and clofe at the 
approach of excited wax, when brought within 
10 inches of them B : if the wax is brought within 
3 or 4 inches, they diverge again, in confequence 
thereof C: as the wax is withdrawn, they converge 
again, D, till it gets beyond the diftance of its in- 
fluence, when they begin to diverge again ; and, as 
the wax is withdrawn ftill farther, they continue to 
open, in confequence of the electricity in the fog, 
till they reach their original diftance from each other 
E. There is very little difturbance by the wind, 
and the little there is, only wafts them in a fmall 
degree, but they keep feparate. If they are held 
near the tiling, or brick-work, of a neighbouring 
houfe, they clofe, F ; but begin to diverge again, at 
the diftance of 3 or 4 feet from it, G j and their di- 
vergence increases, as they recede from the building, 
till they feparate | or | inch, as at firft, H. 
IT 
Vql.’ LX II. 
Memo- 
