( ) 
done of late : Yet the leaft of its Performances under 
the foremention’d Inconveniencies is very notable. But 
to proceed : When the Glafs became hotteft by tile 
greateft Attrition, it did then fend forth fuch quantity 
of Effluvia, not only performing the Effe&s before- 
mentioned with feetningly greater Vigour, but being 
nearly apply’d to the Face, or any tender part, might 
be fencibly felt, as if the Part was pufht with the 
points of a confiderable number of weak Hairs. In 
this place I think it will not be amifs to take no- 
tice, That, confidering the Vigorous Aftion of the Ef~ 
fiuivum, I thought it would not be. unneceffary to at- 
tempt a difcovery of the figure of its Motion, by Ap- 
proaching the Affricated Tube to the flame of a Candle, 
Smoak, Steem, Duft, and to the Surfaces of Liquids $ 
which l did without any manner of fuccefs; And which 
I wholly attribute to the reafon before given, of the 
Humid Effluvia fuddenly Condenfing on the Warm Glafs $ 
fo the Oieagenous Quality of the Flame and Smoak, the 
Moiftnefs of the Steam, the Smalnefs of the Duft, or (he 
Effluvia of the Liquids, would immediately adhere to all 
parts of the Affricated Tube, as it was approacht within 
their Spheres, preventing the Operation of its Effluvia. 
which then feem’d to be ftopt, or retir’d within itfelf j 
and requir’d a new Attrition to give it vent. 
What next occurr’d in this Experiment was, That up- 
on exhaufting the Air from within the Tube by the 
Pump, then altho the like Attrition or greater was given 
it than before, yet very little of the Jffiuvium could be 
difcoverable, by any motion or difturbance given the 
Leaf Brafs, notwithftanding it was held within a quartet 
of the diftance, at which it had been attracted before. 
After this had been continu'd for Tome time with little 
fuccefs : I fay with little fuccefs, Becaufe, fometimes 
fmall parts of the Leaf Brafs, when the Tube vvrs 
held near, and at the fame time very warm, would 
, have 
