[ 8 99 3 
The power therefore which caufes the minus died, 
is lefs than the power which caufes the plus effedt : 
and that this minus effedt arifes intirely front} the re- 
puljive power of the fluid, appears from this, that 
part of the fluid naturally belonging to the glafs, is 
driven off, and eledtrifies plus other bodies placed 
beyond it. 
From hence I colledt, that the three different ef- 
fects, viz. the eledtrifying glafs plus on both fides ; 
or plus on one fide , and minus on the other ; or, 
laftly, minus on both fides j are occafioned by the 
different degrees of the fame power and refinance in 
the refpedlive experiments with the fame glafs. 
If, on the other hand, the three laft experiments 
are made with the minus , inftead of the plus eledtri- 
city, the appearances, and confequently the reafon- 
ing upon them, are inverted : for the plus appearance, 
in that cafe, muff be owing to the tendency of the 
fluid from the earth, air, and other neighbouring- 
bodies, towards the oppofite fide of the glafs, where 
the power adts, which caufes the minus appearance. 
This regular converfion ferves to confirm the truth 
of the principles affigned. 
And here, with your Lordfhip’s leave, I fhall fet 
down fome farther experiments, moft of which have 
been made with a view to fliew, that a plus eledtri- 
city may be produced by means of a minus electri- 
city. 
Having eledlrified the infide of a large Leyden 
bottle plus , by means of a condudting-wire from an 
excited glafs globe, I fet it upon a (land of prepared 
wood, and took away the condudting-wire ; after 
which, the mouth of the bottle was elofed with a 
Vol. LI, fZ flopk 
