• ( 120 ) 
part of an Inch in thicknefs ; and even on thofe Parts, 
for ought that I could difcover,the Light and Figure ap- 
peared, as vivid, and diftinguifhible, as any where 
elfe. The Light produc’d, is not at all difcernible thro’ 
the Body of the Wax, but only to be lookM^ upon thro* 
the tranfparent part of the Glafs : and notwithffanding ^ 
fome parts of the Sealing- Wax’did not adhere fo clofe to 
the Glafs, as others, yet the Light appeared "on thofe • 
parts as on the other. Now whether the Light^roduced • 
on the Sealing-Wax, was from t\\Q Effluvia provokt by j 
the Attrition of the furrounding Body of Glafs, or from 
its own difpofitioil-fo to ‘do in mch a Medium, I cannot 
determine; it being of the fame colour and likenefs to 
that of Glafs, in all refpeds, except, that upon a fmall ' 
quantity of Air being let into the Receiver, the Light ■ 
wholly difappear’d in that part lin’d with the Wax, and ' 
notin the other. I' farther obferved, when all the Air 
was let in, that the Hoop of Threads being held over f 
the Glafs, the Threads would'be attracted at a larger di- 
ftance, from that part of it lin’d with the Wax, than the t 
other ; which feems to me to proceed from the United f 
Strength of both their Effluvia, I 
Upon a .Repetition of this Experiment, I obferved, 
that the AVax within the Glafs would attrad Bodies ap- ’ 
preach’d near its outfide, and that even in Facuo fwhich ; 
is a Difeovery that I never could make from any other f 
Body, in fuch a Medium, except the Magnet.) ' For hold- ]■ 
ing the Hoipp of Threads over it, while it was in that | 
State, the Threads would be directed, but not with that J 
Vigour as when all the Air was let in ; yet here was that f 
fenfible difference, that when the Threads were held o- t 
ver that part of the Glafs free from the lining' of Wax, ‘ 
the Threads would not be attra£fed, b*it approaching * ; 
them within the reach of tliQ Effluvia of the Wax, they 
would eagerly fly towards it. Hence it feems deduci- 
ble, that the Figure of the Parts of Glafs and Sealing- 
Wax 
