• ( 88 ) 
and fometimes a Piece of the fame Brafs might be car- 
ried all about a Room, feemingly riding or floating 
on the Surface of its Effluvia. In (hort, 1 find no diffe- 
rence in the Laws of cue different Effluvia, tho’ thofe of 
Glafs feeni to be much the ftrongeft, and to aft with the 
' greateft Vigour. Thus far the Day light Experiments. 
Upon the Approach of Night, Icaufed the fame Mo- 
tion to be given to the Wax Cylinder (begging leave to 
call it fo) as I had done in the Day time, to fee what 
Light might then be produc’d on the Attrition of it. I 
apply ’d foine clean new Flannel on it, but could difcc- 
ver little or no Light ^ yet afterwards upon holding my 
naked hand, as ufual, on the Glafs Globe, a confidera- 
ble Light was vilible, tho only where the Attrition v/as 
made, nor would it live any longer than the Motion. [ 
try’d if a Light would be communicated to one’s Finger 
approacht near it, (as in the Experiment of the premen- 
tion’d Glafs,) but could obtain no fuch Appearance with- 
out touching it. This in a great meafure befpeaks the 
Weaknefs of its Effluvia. I likewife have try’d what Light 
might be produc’d from it, by giving Motion to it in 
Vacuo 5 and altho I was forc’d to ufe Flannel there, yet a 
very diftinguilhing Light appear’d on each Arm of the 
Brafs Spring that gently embrac’d it 3 and doubt not, but 
if my Hand could be made ufe of to. rub the Wax in fuch 
a Medium, the Light would have been much greater : 
For the Light produc’d upon the Attrition of the Flannel 
on the Wax in Vacuo, was rather better than that which 
was produc’d upon the Attrition of it with my naked 
Hand in common Air. 
From all which Experiments it appears to me, that 
the largenefs or littlencfs of Light or Attraftion, pro- 
ducible from Bodies by Attrition, proceeds from the 
Number and Strength of their Refpeftive Effluvia, and 
fo of all Bodies reciprocally falling under the fame 
Claffis, 
Now 
