( ) 
good Diftances : Sometimes in their Motions towards, 
and fometimes even touching it, they would fuddenly 
be Repell’d back to the diftance of 4 or 5 Inches, repeat- 
ing the fame feveral times with great Velocity in a very 
furprizing manner. Sometimes the Bodies would move 
but llowly towards the Tube, fometimes remain a Pmall 
time fufpended between the Glafs and the Table on 
which the Brafs Leaf was laid ^ and fometimes feem to 
Hide along the fides of it without touching. All which 
Phenomena, altho they do not happen at every Tryal 
exa&ly as I have here deliver’d them, yet I have fome- 
times feen them, and in a great meafure at all times, are 
very agreeable to this account, notwithftanding the 
Force and Vigour of the Effluvium is fometimes lefs than 
what at other times I have found it. The Reafon of 
which feems to me to proceed from the Different Tem- 
peratures of the Air at the time the Experiments are 
made $ for when it happens that abundance of Humid 
Particles (as fometimes there are) are fwimming in the 
Air, there is no difficulty to believe, but the Refinance 
of fuch Particles may mightily impede the Force and 
Extent of the Effluvium : Or, which is much to the 
fame purpo e, fuddenly Condenfe on the warm Tube, 
thereby Hindring or Choaking the Paftages of the Efflu- 
via, For I find Moiftnefs at all times an utter Enemy to 
Attempts of this nature $ befides, the quality of the Ef- 
fluvium feems to be fuch, that I could not ( in an Experi- 
ment lately made) with ail ray endeavours, caufe it to 
affedt one of the premention’d Bodies thro a piece of fine 
Muflin, notwithstanding it was held very near it, and 
at the fame time would AttradT or give Motion to 
the fame Body at three or four times that diftance, 
the Muflin not interpofing. Moreover , I cannot tell 
but the Coldnefs of the Air at the fame time may 
Concur 5 for when this Experiment was firft made it 
•was Summer time, and Dry Weather 5 and then it 
feem’d to me to fucceed fomething better than it has 
done 
