$. ( Wh^h IS equivaltiit i but more eafily admiQiftr^^ 
Whether if fuch a Tube, fo filled, be at firft fo iDcHuelt (as 
GF) that its height above AB be Ie(s than 29 loches^^ may 
not be leifurely and gently ereftedj fo as to remain full, not^ 
only to the height of I, but of G or D > 
6. Whether cleanfed Quiekfilvqr will^ in the open AJfj 
run in a Siphon higher that 2 9 Inches > 
7. If not in the Air, whether it-wili fo run^ if the lower 
teg open into well-cleanftd Water > 
§♦ (Which I do principally recommend^) In a Tube fo 
filled with cleanfed Qaickfilver, as to ftand top-full at a 
greater height than the ufual Standard , as CD ; in cafe 
feme part be forced out, not by admifSon of Air but by 
J^S?}^g ^he Tube^ ( I fuppofc as much as HDJ and a flop 
then made: Whether the reft CH (at a greater height than 
I^ the ufual Standard^) may be made fo to ftand of it felf, 
notwithftanding the voidance of H For by this Ex- 
periment alone, if it fuccecd, it will appear^ that it is not 
onely want of room for the Stibtile matter to recoiled: it 
felf, which hindersthe fofpended Qiiickfilver from falling 3 
but rather (unlefi fbme probable caufe can be found,) the 
want of a Spring to put it in motion. If it will not fuGceedjj 
tfhould rather think 3 the Springy, Air doth make its way 
through the (^lickfilver than through the Glafs. 
9. Whether cleaofed Quickfilver will remain fufpended 
in an inverted Tube ( at leaft a fhort one 5 and with a fmall 
Orifice, ) though its Orifice C beno immerg'd in Qtiick- 
filver, bur either in the open Aifj or at leaft in Water } 
10^ If fo« then whether it will do the like, if^ a little 
being forced out, there be fome void room left at the:^op, 
atHD? 
Thcfe are nice Experimeqts, and of fome difflcultys 
but if carefully adminiftred , may be of good ufc in our 
fearch after the true nature of Gravity^* Which may poffi* 
bly have a greater conncKion with the Spring of the Air, 
than men are aware of 3 fince on the prefence orabfenee 
thereof doth mainly depend the falling or not falling of 
Bodies> 
