I 
(9^ ] , 
a greater Quantity of a hea\^y Body; for the Reaion of 
this, as 'tis given by my Brother, does not ContradiO: my 
Notion. The Account likewiftj that He gives of Chymi- 
cal Precipitation agrees very well with what I propofe : So 
that of thefe I fhall fay no more. 
But becaufe in the beginning of my Difcourie, I fay that 
the foremen tioned Law of Hydrofiaticks is a httle defeftive^ 
I defire to explain my felf a little further in that Point. In 
Weights falling through the Air, were Gravity only confi- ^ 
derM, the Proportions of their Delcents would be exaftly 
as Galileo has Demonftrated; but it is allowM by all^ that the 
Refiltance of the Air, not being ccnfiderM in tliofe Demon- 
ftrations , they are not Mathematically true in Praftift, 
but thac Really there is fbme thing of that Proportion 
hindredby the Airs Refiftance. Now, what is this lels 
than to fty, that the Refiftance of the Air takes off fbme 
of the Operation of Gravity ^ or is able to withftand or 
oppofe part of its Adion f And if fb, what fhall we fay 
were an Iron Sphere let through a Medium of Water f 
Surely the Proportions of its defcents would be much more 
difturbed herein, as Water is much more Solid and diffi- 
cult to be feperated or pafTed through than Air, and con« 
fequently we muft needs Graunt, that more of the Opera- 
tion of Gravity, is taken off or Refifted by this Oppofiti- 
on of the Water," than that of the Air. And iffo. Surely 
there may be a certain degree of Gravity , that may be 
quite taken off by the Refiftance of the Water : Were a 
Piftol Bullet let fall through the Air, it would Defcend im- 
perceptibly nigh the Proportions that Galileo has aftigned, 
but were a fingle grain of Sand fo let fall, it would be much 
"hiridred in its Courfe, and the half of this Grain would be 
more obftruQied ; what fhall we then fay of the ten thou- 
fandth part, or of a part the ten thoufand millionth of this, 
and again of the Infinite Subdivifions of that, till at laft we 
come to a part that would be wholly refifted, or kept up \ 
