98 Mr. henly’s Experiments and 
tion as an incitement to the ftudy) that, compared with 
the facts ftill undifcovered in that branch of pliilofophy, 
they bear but a very fmall proportion. 
PART III. 
Obfervations on fome new and fingular phenomena in ex- 
cited and charged glafs ; with experiments jnade in con- 
fequence of thefe phenomena, further illujlrating the 
Franklinian theory of the Leyden bottle ; and a defer ip- 
tion of the apparatus conjiru&ed for that purpofe by 
Mr. HENLY. 
HAVING carefully repeated the experiments with 
the two coated plates of looking-glafs, mentioned in my 
paper on Mr. volta’s machine, and finding with Mr. 
lane, that they exactly agreed with the account given 
by Mr. symmer and Mr. eeles, I was defirous to be fa- 
tisfied whether glaffes of a different thicknefs would be 
differently affected in the experiment. F or this purpofe 
I tried two large fquares of crown or "window-glafs, and 
found them to charge and difeharge exactly as the look- 
ing-glafs plates had done ; but on trying the experiment 
with two plates of Nuremburg glafs, commonly called 
Dutch plates, I was not a little furprifed to find that each 
of 
