[ i°5 J 
Silver prefented it, even fome time after it had been 
taken from the prime Condudor, to another Pcrfon 
who touched the under Surface with his Finger, and 
held it there till he touched the upper Surface with 
a Finger of his other Hand. 
§ XII. This Experiment was fufficiently convincing, 
that the Greatnefs of the eledrical Explofion, in my 
former Trials, was not owing folely to the great 
Quantity of non-eledric Matter contained in the 
Glafies ; as the Explofion from the glafs Plate fil- 
vered was occafioned by about fix Grains of Silver, 
upon which the Electricity was accumulated ; more 
especially as this Explofion was equal, if not fiupe- 
rior, to that from half a Pint of Water contained in 
a thin Glafs as ufual, under the moft favourable Cir- 
cumftances. 
§ XIII. As each of the Surfaces of the glafs Plate 
juft mentioned mcafured fixty four fquare Inches, I 
was defirous of purfuing this Inquiry further ; and' 
accordingly procured a cylindrical glafs Jar blown 
very thin, of fixteen Inches in Heighr, and eighteen 
Inches in Circumference. This I caufed to be co- 
vered both within and without with Leaf-Silver, to 
within an Inch of its Top. This Glafs with its Mar- 
gin made very clean (upon which the Succefs of the 
Experiment confiderably depends) was fully . elec- 
trified by the means of a Piece of Chain, let down 
to the Bottom of the Jar, by a Wire from the prime 
Conductor; and the Explofion made by its being 
placed upon a Plate of Metal, to which was fatten'd 
a Wire conneded to an iron Rod, and this Rod was 
O brought 
