( jopi ) 
in them all, that (bme parts of the Water quit the con- 
tael of the other Water, and join themfelves to the 
Glafs. 
PROPOSITION VI. 
The Particles of Mluickfilvtr are more frongl'j attraPied 
hf one another, than ly 6 (afs. 
Exp I. Fig. 5'.^ If a fmall Tube as A B, open at 
both ends, be dipt into a Glaft Vcflel fill’d with Mer- 
cury, and be held clofe to the fide of the Vefiel, that 
the rife of the Mercury within it may appear ; the Mer- 
cury will partly enter into the Tube, but will fiand 
within it at feme depth, as CE, below the Surface of 
the Qjjickfilver in the Vefiel, CD; and this depth will 
always be reciprocally as the Diameter of the Tube 
In this Experiment a Column of Quickfilver of the 
height C E endeavours to force the Mercury higher in- 
to the Tube ; and as Glafs has been already prov d to 
attract Quickfilver, the AttradHon of the annular Sur 
face on the infide of the Tube, which is contiguous to 
the upper part of the Mercury, will likewife confpire to 
farther its afeenr. What oppofes the afeent of the 
Quickfilvet, is the Power, by which that part of it, 
which endeavours to rife into the Glafs, is drawn back 
by the Atrra( 9 :ion of the other Mercury, with which it 
is in contad laterally, and this does not only balance the 
Atcradion of the Glafs, but likewife the weight of the 
Column of Mercury of the height C E, and conle- 
qucntly this Attradion is confiderably ftronger than 
the Attradion of the Glals. 
The caufe therefore that fufpsnds the weight of the 
Column of Mercury CE, being the difference between 
the Attradion of the annular Surface of the Tube at E, 
and that of an equal Surface of the Quickfilver in the 
Ciftero, from which the Mercury, that endeavours to 
10 F rife 
