( ) 
A will be to- the momentaneous lofs of force in- the 
Globe i5, as the 'Velocity of the Globe B, to the Velo- 
city of the Globe A ; and the whole force of the Globe 
A has been found to bear the fame ratio to the whole 
force of the Globe B ; confequently thefe Globes, 
while they penetrate equal Spaces into the Subftance, 
lofe parts of their force, which bear the fame pro- 
portion to the whole: and therefore, if their Velo- 
cities beat any time reciprocally in the Subduplicate 
ratio of their Weights, fb that the forces or degrees of 
Motion, with which they move, be reciprocally pro- 
portional to their Velocities, the forces, with which 
they prefs into the yielding Subftance, at equal In- 
dentures made in the Subftance, will continue in the 
fame Proportion j and therefore upon the Theory of 
Refiftance here fuppofed, when the whole Force and 
Motion of both thefe Globes is entirely lofl, they 
will be plunged into the Subfiance at equal Depths. 
Now whereas in the Experiment of Polcrms, the 
Globes, falling from Heights reciprocally proportional 
to their Weights, flrike upon the yielding Subfiance 
with Velocities reciprocally in the Subduplicate pro- 
portion of their Weights, and the Effed is in all 
Cafes found to be, what is here deduced from the 
Theory of Refiftance, J have propofed ; it is a fuf- 
ficient Confirmation of the Truth of this Theory. 
Only here. Sir, I ought to obferve to you. That I have 
fuppofed the Globes to beftopt by the whole Refiftance 
of the Subfiance, they move againft ; although in ftrid- 
nefs they are ftopt only by the excefs of that Refi- 
ftance above the Atftion of Gravity upon them. But 
I have negleded the Confideration of the Adion of 
Gravity, that being but fmall in Proportion to the 
Refiftance, as will appear from the Globes being 
much more fpeedily ftopt by this Refiftance, than 
