Notion^ as itis there iDfertcd : And^ whether he have fioce 
had leifure, atnidft a great prefs of other bufioelij to purfue 
ity I am not certain. 
Now, though I would not wholly exclude this, if fuch 
ftiall be found to be ( but only fufpend roy Aflent til! it be 
evinced 5) yet furely there inuft be fomewhat more in it 
"ihanthatof this Subtile matter, tololvethe Phsmmemn^ 
notwithftandiog the two Experiments now alledged by 
MMygem in favour of it. For, if this Matter be fo fubtile 
as to prefs, through the top of the Glafs , upon the Quiek- 
filver (and confequently through the upper upon thcnca- 
ther of the two-Marble/^) as is acknowledged 5 (and with- 
out which it is no more able to precipitate the Quickfilver 
while impure, and when it is in part iubfidcd, than when it 
is pure, and the Tube top full :) I do not fee, why it (hould 
not balance it felf (above and below ) in the fame manner 
as Common Air would do, if the Tube were pervious to 
it at both ends, and the Quickfilver, by the preponderance 
of its own weight, fall prefently. 
And the Jfifiper^ That, though the Glafs be penetrated 
by it, yet not in To copious a manner as where no Glafs is 5 
doth nor, to me, folve the difficulty ; Becaufe the fame ob- 
ftacledoth juftin thefame manner remain, when the Tube 
is in part emptied, and^when the Quickfilver is un-purged: 
the pores of the Glafs not being, by either of thofe, made 
more open or more pervious. And if we fuppofe the Sub- 
tile matter by percolation to be ftrain'd through, with 
fomc difficulty /as Air or Water would be through a cloth,) 
this might poflibly caufe the Quickfilver , when it docs 
fink, to Rok gradnaff)!-^ but not (as we fee it, ) fuddenl) to 
fall to the height of 29 Inches 5 as from D to I. 
^ The Connexion or Cohjcfion of the parts of Quickfilver, 
euher each toother, or to the fides of the Glafs , which 
Mr.Hugens fuppofeth to require for their feparation a great- 
er force, than is in thefe percolated particles till they have 
room made for them to combine 5 fecms to me the lefscon- 
fiderable, becatiTcit is not foneceflary to feparate them 
from 
