( 743 ) 
Fig. The Tube CD is compofed of two Parts, ifi 
the wider of which the Water will rife fpontaneoufly 
to the height B but the narrower Part, if it were of 
a fufficient length, would raife the Water to a height 
equal to C D 
Exp. 7. This Tube being fill’d with Water, and the 
wider end C immerft in the fiagnant Water d B, the 
whole continues fufpended. 
E^p. 8. Fig. 4. The narrower end being immerfl, 
the Water immediately fubfides, and ftands at lafl at 
the height D G equal to B F. 
From which it is manifeft, that -the fufpenfion of the 
Water in the former of thefe Experiments is not owing- 
to the attradion of the containing Surface .* fince, if 
that were true, this Surface being the fame, when the 
Tube is inverted, would fufpend the Water at the fame- 
height. 
Having fhown the infufficiency of this Hypothefis, 
I come now to the real caufe of that Pha:nomcnon,^ 
which is the attradion of the Periphery, or Sedion of 
the Surface of the Tube, to which the upper Surface of 
the Water is contiguous and coheres. - 
For this is the only part of the Tube, from which thC’ 
Water muft recede upon its fubfiding, and confequently' 
the only one, which by the force, of its cohefion, or at- 
tradion, oppofes the defeent of the Water. 
This likewife is a caufe proportional to the efTed, 
which it produces ; fince that Periphery, and the Co- 
lumn fufpended, are both in the fame proportion as the 
Diameter of the Tube. 
Tho’ from either of thefe particulars it were cafy to 
draw a juft Demonftration, yet to put the matter out of 
all doubt, it may be proper to confirm this afiertion> 
as we have done the former, by adual Experiment. 
