« [ 222 ] 
1 have already (hewn, that the Attradion between 
any two Bodies' will always be in proportion to the 
d if. rent Quantity of cledric Effluvia they are pol- 
faTcd of j the greater that Difference is, the greater 
will be the Attradion. In order therefore to ob- 
tain this equal Attradion at firft, the Leaf- Silver mult 
be imbued with a greater or Idler Quantity, m pro- 
portion as the Plate is more flrongly or weakly 
cledrified; but always with a much lefs Quantity 
than the Plate j and like wife the lower Plate will 
require to be placed at different Diftances, in propor- 
tion to the Quantity of eledric Matter the upper Plate 
is po fie fled of. As therefore the Sufpeniion of the 
Silver depends upon the exad Proportion of Attrac- 
tion (arifing from the different Quantities of elednc 
Matter) in the two Plates and Leaf-Silver, it follows, 
that whatever alters the Quantity contained in any 
one of them would prevent the Sufpenfon. 
It is well known, that, by the Attraction between 
any two Bodies, the electric Effluvia are conti- 
nually drawn off from that which has the greatest 
Quantity of them, till the other being fumuent y 
impregnated, the Attraction ceafes. In order there- 
fore to preferve thefe Proportions, it is neceflary, 
that as faft as the non-electric Plate draws off any 
of the Effluvia from the Leaf-Silver, it fhould part 
with it agamj and fo, by continuing to be a Non- 
electric, an equal Degree of Attraction be preferve , 
and again, that the Leaf-Silver fhould receive a frem 
Supply from the eledrical Plate, equal to what it 
conflantly parts with} and the electrical Plate mult 
likewife receive an equal Supply from the Globe 
- and 
V* 
