514 Mr. henly’s 'Experiments and 
phenomena were produced ; and might, Mr. adams ob- 
ferved, be repeated for a long time, without any renewal 
of the excitation of the wax, any farther than the re- 
placing the board might be faid to excite it. It imme- 
diately occurred to me, that, as this plate of wax, See , 
was made by excitation, a ftrong negative eleCtric, the 
phenomena produced by it could only be the reverie of 
thole I had formerly made with an excited plate of glafs, 
and publilhed in the Phil. Tranf. vol. LXIV. part ij. p. 
407.; viz. where mine were politive, thefe were nega- 
tive ; and where mine were negative, thefe were politive. 
But, to determine this matter, I made the following ex- 
periments. Firft, I infulated Mr. canton’s electrometer, 
and having electrified the balls politively, I prefented 
toward them the excited wax, as foon as it had been fe- 
parated from the coated board; and perceived, as I ex- 
pected, that the balls were attracted by the w r ax ; but, if 
the balls were electrified negatively, they were as plainly 
repelled by it. The board produced juft the contrary 
efteCt. Secondly, I held my Leyden vacuum , or analyfis 
of the Leyden bottle, deferibed Phil. Tranf. vol. LXIV. 
part 11. p. 400. by the coated bulb, and touched the 
brafs ball on the neck of it with the coated board, the 
moment it had been feparated from the excited wax, Sec. 
and inftantly perceived a variety of beautiful ftreams 
dart from the point of the wire in the bottle, and lpread 
themfelves in different directions through the bulb. On 
repeating the experiment, and prefenting the coated part 
of the bottle toward the board, a fmall fpark of light 
appeared upon the point of the incloled wire; a plain 
indication 
