on the Electrophorus. ixcztp 
nous cake, and no metallic communication exift between 
the metal plate and that metal upon which the cake is 
fattened). If theknobof the phial, thus placed, be touched 
by the finger, and then taken away, holding it by the 
knob, the force of fhe eleCtrophore is found to be re- 
markably increafed. 
But a more pleafing way of increafing the eleCtrical 
force of this inftrument is by transferring alternately th«- 
metal plate from one refinous cake to another, and 
Touching it after it is placed upon* the cakes. By this 
method both cakes acquire continually more and more 
electricity ; fo that in a fhort time, by this alternate tran- 
flation, the metal plate returns from either cake quite 
overcharged; and thus Leyden phials may be charged, 
by it very ftrongly, and even fo as to break them. It is 
very remarkable, that by this method the metal plate re- 
turns from one cake in a pofitive, and from the other in 
a negative ftate. 
This manner of increafing the two electricities was 
found out by my learned friend Dr. klinkoch, profeflor 
in the Univerfity of. Prague, foon after I had given him. 
a defcription of this new inftrument, which I had re- 
ceived from his Royal Highnefs the Arch-duke Ferdi- 
nand a very little while after Mr. volta had invented: 
it. 
lit 
