( 6z ) 
to the former, (a) except only that, agreeably to what 
Merjenms himlelf remarked, when the Weight dei’cends 
from great heights, an Altitude fomewhat greater than 
this Rule implies is required to raife the other Weight 
as much as is defired. But whether the bending of the 
Arm cf the Ballancc, when aded upon with a great 
force, or whether any increafe of Fridion in this Cafe, 
occafion the Irregularity here mentioned, we need not 
ftridly enquire ; for this Irregularity is yet lefs recon- 
cileable with the new Opinion, than the regular 
Effeds of the Experiment. Hence therefore we may 
fee, that the very Method of reafbning, w'hich being 
applied erroneoufly, is fuppofed to prove Mr. Leibnitz^ 
Sentiment concerning the force of Bodies in Motion, 
will, when jufHy ufed, confirm the other Opinion in 
relation to that Matter. 
But as I havealTerted in the beginning of this Letter, 
that the very Experiment of PoUms is not only recon- 
cileable to the common Dodrine of Motion, as I have 
now demonflraced ; but even that it does it felf make 
manifefl the great unreafonablenefs, if not the abfolute 
Abfurdity, of Mr. Leibnitz's Opinion ; it remains that 
I briefly make proof of this. 
If two Globes A and R, of equal Magnitude but 
of different Weights, ftriking on a yielding Subflance 
with equal force, in every Cafe lofe all their Moti- 
on at equal Depths, it is neceflary that at all times, 
during their Motion, they lofe equal Degrees of force, 
• when they bear upon equal Portions of the Subflance, 
in entring equal Spaces into the Subflance. This will 
be eafily feen from what has before been faid. Now 
W’hereas Mr. Leibnitz fuppofes the powder of Gravity to 
{a) ’J Gravefande Phyfic. Mlem. Tom. I. p. 59. 
give 
