( ) 
E X P E R I M E N T III. 
Having try’d fhe Effeft of the difcontinuing or inter- 
rupting of the Effluvia of the Affric^ted Tube on its out- 
ward Surface, I was willing to try what would enfue, by 
filling its Cavity v/ith a Body, which I did, by plugging, 
up one end of it with a Cork, then pouring in at the o- 
ther dry Writing Sand till it was near full : After that, the 
Attrition was diligently made, and when held towards 
the pieces of Brafs as ufual, no motion was given, till it 
arriv’d within an Inch or thereabouts of them. And 
thus on leverai Tryals it anfwer’dmuch alike* And if at 
the fame time the Sand be (hot fuddenly out, the Tube 
will attrad the fame Bodies at double or treble the fore- 
mention’d dilfance, without any frefh Attrition 5 which 
plainly fhews, that altho’ the Tube will attradt wheh ap- 
proach’d near, yet the Body within is a fenfible Impedi- 
ment to the Extenrion of its Adion without. This brings 
to my mind the unfuccersfulnefs of the Attempt I made 
tp attrad Bodies vvith a Tube exhaufted of its Air 3 which 
feems to conclude, there being no Air within, to bear 
the hffluvia from its Body, a centimum of their Parts 
maft conlequently be prevented, 
Now how far thefe Experiments and Obfervatjons 
lerve to A 'count for the premention’d Eh^nomenon^ in 
Relation to the Modon given Bodies within the Glafs' 
by the appro ach of a Body towards its ourfidc, I leave 
wholly to ihi^-Homnrabk Society to determine. 
ll Aa 
