_Answer to some of the foregoing Subjects.--How long the Leyden
Bottle may be kept charged.--Heated Glass rendered permeable by the
electric Fluid.--Electrical Attraction and Repulsion.--Reply to
other Subjects in the preceding Paper.--Numerous Ways of kindling
Fire.--Explosion of Water.--Knobs and Points._
_London, Feb. 20, 1762._