( lopi ) 
rife into tlu Tube, raufl: recede, iaorder to unite it fclf 
to fuch an Annulus of the Glafs, will always be pro- 
portional to that annular Surface, or to the Diameter 
of the Tube. And fince the Column fuftain’d mud be 
proportional totbeCaufe that fufpends it, that Column 
mufl; likewife be as the Diameter of the Tube. But 
the Column fufpended is as the Square of the Diame- 
ter of the Tube and the height C E conjointly ; from 
which it follows that the height C E muft be as the 
Diameter of the Tube reciprocally, as it is found to be 
by Experiment. 
The Experiment of the Afcent of Water above the 
Level in a Capillary Tube, is juft the Reverfe of this. 
Exf. II. fig. 6. Quickfilver being poured into the 
inverted Siphon AGB, one of whofe Legs AC is nar- 
rower than the other C B ; the height C E, at which the 
Mercury ftands in the wider Leg CB, is greater than 
the height C D, at which it ftands in the narrower Leg 
C A, 
On the contrary, Water ftands higher in the narrow- 
er Leg, than in the wider. 
Exp. in. Fig. 7. xA B C D leprefents a retftangulao 
plane of Glafs, which makes one fide of a w’ooden 
Box. On the infide of this is another Glals plane of 
the fame fize, which at the end A C is preft clofe to 
the former, and opens to a fmall Angle at die oppofite 
end B D. When Mercury is pour’d into this Box to 
any height as C E, it infinuates it felf between the 
two Glafs planes, and rifing to different heights be- 
tween the Glaffes where the opening is greater or lels, 
it forms the common Hyperbola C G F; one of whofe 
Afympeotes E F is the line on which the Surface of the 
Mercury in the Box touches the inner Glafs; rise other 
is the line A C, in which tlie Planes are join’d., < This 
Hypetbola being carefully examined by Mr. Hankshee 
