: Miscellaneous Intelligence. 289 
inductive. electrification simply proportional to the atmospheric potential 
at the position occupied by the centre of the ball, and would continue to 
clouds. But I think the best possible plan in most respects, if it turns 
be practicable, of which I can have little doubt, will be to use, in- 
of the ordinary fixed insulated conductor with a point, a fixed con- 
ductor of similar form, but hollow, and containing within-itself an ap- 
paratus for making hydrogen, and blowing small soap-bubbles of that 
m a fine tube terminating as nearly as may be in a point, at a 
~ 
ries of undulations succeeding each other at intervals of twenty min- 
wes or half an hour, the difference of elevation and depression rarely 
Ing six inches, and being usually much less. They are more per- 
