1046 Dr. ingenhousz’s Experiments 
the received theory, by taking inftead of an eleCtrophore 
only a common pane of glafs,. adapted as a magical pic- 
ture, with this difference only, that both coatings may be 
taken off by filk firings fattened to them, or by pieces of 
fealing wax. Having eftablifhed a free communication 
between the common ftock and the under coating, apply 
the upper coating to the prime conductor of an ordinary 
electrical machine, the pane of glafs is charged in the 
common way. The prime conductor has forced a fuper- 
abundant quantity of eleCtric fluid upon the furface next 
to it, by means of the coating, and as much is forced out 
of the oppolite furface, and driven into the common 
ftock. Open a metallic communication between the two 
coatings, and inftantly the glafs will be, as we call it, dis- 
charged : and, indeed, it is fo to all appearance ; but, if 
we examine more accurately what has happened, we 
fhall find, that the upper metallic coating has parted, by 
the difcharge, with all the eleCtric fluid which the prime 
conductor had forced upon it, and even with that part of 
its own eleCtric fluid which the repellent power of the 
fuper-abundant eleCtric fluid, communicated to that fur- 
face of the glafs by the force of charging, had driven 
into it ; and that the under coating has recovered as much 
as the glafs had forced through it into the common ftock, 
and has above that acquired or abforbed that additional 
quantity 
