( ) 
-the Collar of Leather in the Brafs-Plate that covered 
the Top of the open Receiver ; as in the Experiment 
of letting fall the Guinea and Feather in vacuo. 
Then the Ball was drawn up to the Top of the Re* 
ceiver, and the Top of the fmall Stand, covered with 
Paper, was laid on the wet Leather on the Plate of 
the Pump, and Leaf*Brafs laid on the fame. Then 
the Air was exhaufted, when the Glafs Ball was let 
"down to about an Inch, or fomewhat more, towards 
the Pieces of Leaf-Brafs : Many of them were at- 
traded by it. Then the Ait- was let into the Re- 
ceiver, and the Leaf-Brafs laid on the Stand, the Ball 
being, as before, fufpended, was let down to about the 
fame Diftance from the Leaf-Brafs as before, and 
there feemed to be very little Difference in the At* 
tra&ion. 
I have made the fame Experiments with Sulphur, 
Shell-Lac, Rofio, and white Bees-Wax. Thefe would 
be attracted to the Ideight of an Inch and a half by 
Eftimation •, and when the Experiment was made 
with the Receiver full of Air, there was very little, 
if any Difference in the Height of the Attra&ion, 
when there was the fame Time fpent before the At- 
traction was begun in pleno, as there was required 
to exhauft the Receiver. 
■ v. ? ' *•* ' : ' } ‘ ' - ‘ il - ' ' V ' 
‘A * ' •; ■ ■ t =, Vi ’ v ’ ' ' ' . • . •• - ' > ' * >• •’ • ■ ' 
A C A- 
