[ 7 °°] 
Originally-Eledric, before the Eie&ricity exerts the 
lead Attradion ; and then this Power isobferved firfl; 
at that Part of the Non-eledric the moft remote from 
the Originally-Eledric. Thus, for Example, by an ex- 
cited Tube held over it, Leaf-Gold will be attraded 
thro* Glafs, Cloth, &c. held horizontally in the Hand 
of a Man (landing upon the Floor, and this Attraction 
is exerted to a confiderable Diftance. On the con- 
trary, the rubbed Tube will not attrad Leaf-Gold, or 
other light Bodies, however near, through Silver, 
Tin, the thinned Board, Paper, or any other Non- 
Elcdric, held in the manner before-mentiomd. But 
if you rub the Paper over with Wax melted, and 
by that means introduce the Originally-Eledric 
therein, you obferve the Eledricity ads in right 
Lines, and attrads powerfully. And here I mud 
beg Leave to remind you, not only of the former 
Corollary, but of fome of the former Experiments 
alfo ; by which it appears, that although, to make 
a Non-Eledric exert any Power, we mud excite the 
whole Mafs thereof, yet we can excite what Part, 
and what only, of an Originally-Eledric we pieafe. 
Thus we obferve, that Leaf Gold, and the Seed of 
Cotton-Grafs (which grows upon Bogs, and is a very 
proper Subjedfor thefe Inquiries) are attraded under 
a glafs Jar made warm*, and turned Bottom up- 
wards, upon which are placed Books, and feveral 
other 
* I have conftantly obferved, that the electrical Attraction through 
Glafs is much more powerful when the Glafs is made warm, than when 
cold. This EffeCt may proceed from a twofold Caufe : Firft, warm 
Glafs does not condenfe the Water from the Air, which makes the Glafs, 
as has beenbefore before demonftrated (p. 1 1 1) a Conductor of EleClricity ; 
Secondly ; As Heat enlarges the Dimenfions of all known Bodies, and 
confequently caufes their conflituent Parts to recede from each other, the 
electrical Effluvia, pafflng in jftraight Lines, find probably a more ready 
Paffage thro' their Pores. 
