Mr. Ben net’s appendix, &c. ** 
j j 
1'enting it to the cap of the electrometer (if not frill in -too fmali 
a quantity) it will caufe a divergence of the leaf gold, by an 
electricity of the fame kind with that which was communi- 
cated to the cap, and in which cap a fmali quantity of eleCtri- 
city remains. Thus both the larger and fmaller condenfers of 
M. Vol ta are connected with the electrometer, fo as to be uled 
in the molt limple, expeditious, and convenient manner I can 
think of. Their amazing power of condenling eleCtricity is- 
fufficiently explained in M. Volta’s Paper, before publifhed 
in the Philofophical TranfaCtions. 
To the experiments on blowing powders from a pair of 
bellows I have to add, that if the powder is blown at about 
the distance of three inches upon a plate which is moiftened 
or oiled, its eleCtricity is contrary to that produced by 
blowing upon a dry plate. This fhews that the eleCtricity of 
the flreams of powder ilfuing out of the bellows is only con- 
trary to the more expanded part, becaufe it is within the in- 
fluence of its atmofphere ; for when this is deftroyed by the 
adhefion of the powder to the moiftened plate, it is negative 
when the bellows are politive, as it was before pofitive when 
the more expanded cloud was negative. 
I have alfo to add, that the experiments on evaporation of 
water may be tried with more eafe and certainty of fuccefs by 
heating the lmall end of a tobacco pipe, and pouring water 
into the head, which, running down to the heated part, is 
fuddenly expanded, and will fhew its electricity when projected 
upon the cap of the electrometer, more fenflbly than any other 
way I have tried. If the pipe be fixed in a cloven flick, and 
placed in the cap of one electrometer, whilft the fleam is pro- 
jected upon another, it produces both electricities at once. 
Vol. LXXVII. F Spirit 
