C l6 ' ] 
Perfon to be ele&rify'd immediately handing on a 
Cake of Wax, and holding one End of the Lath, 
another Perfon handing about the Middle of the Di- 
ftance on another Cake, and fupporring the Lath, 
and a third Perion at the further End, who held the 
other End of the Lath, and fir'd the Spirit,* and fome- 
times held the Spoon, while a fourth Perfon fir'd 
them by Repulfion. In this Experiment, inftead of 
common Thread, I ufed Silver and GoldTwift, of 
what, I think, the Ladies call Plate j and I have Rea- 
fon to think this much better than the former. 
I am fo far from being of Abbe Nollefs Mind, 
that I think no Sort of Glafs is Proof againft the 
Effefts of a moift Air. I conclude this from Mr. 
Watforis Experiments and my own. - — I told you 
before where I kept my Tube s and I can allure you, 
I find as great a Difference as can well be in the 
fame Tube, between what it is one Day and the next, 
even when I have feen no great Reafon to expeft, 
from any fenfibie Change in the Air, it fhould be fo. 
But whence arifes that we call Moiftnefs in the Air? 
I have many times known, that the Wind being 
N. and N.E. and tho' it has rained all Day incef- 
fantly, the Air has been as dry (fo far as I could judge 
from natural Hygrometers, and from my Tube) as in 
a fair Day 5 and than fome fair Days, drier, by the 
fame Indications. 
I begin to think, that, by careful Praftice, the glafs 
Tube may be brought to be a good Hygrometer for 
the Air. I wifh the Theory of the Air were more 
diligently and accurately confidered : Certainly it has 
been negle&ed 5 fo Mr. Locke thought, a little before 
he died j and faid, The imperfect Difcourfe of Mr. 
X z ' Boyles, 
