C 427 ] 
has commonly beenfomething that the oppofite Party- 
does not admit, nay, even abfolutely denies. 
Of this it were eafy to produce a Number of Ex- 
amples ; but I {hall content myfelf with two only, 
one taken from each Side. 
Thofe who maintain, That the moving Force is 
as the Weight into the Velocity, lay down for a Prin- 
ciple, or Axiom. That 
When two Bodies meet one another in contrary 
Dire&ions, if their moving Forces be equal, neither 
Body will prevail over the other : And if their moving 
Forces be unequal, the ftronger will always prevail 
over the weaker. 
This the Leibnitian Party deny. They maintain, 
That one of thefe Bodies may prevail over the 
other, though their moving Forces be equal: Nay, 
that, in many Cafes, the weaker will prevail over 
the ftronger. 
It is therefore to no Purpofe to alledge, That the 
Principle above laid down is founded on common 
Senfe ; or that it was always univerfally received, 
till this Difpute began : For, ftnee the oppofite Parry 
now rejeft it, ali Reafoning upon it can have no 
Weight with them ; you muft have recourfe to fome- 
thing elfe. 
On the other hand, thofe who adhere to Mr. Leib » 
nitz s Sentiment, lay down for a Principle, That 
Equal Eflfefts always arife from equal Caufes; pro- 
vided the Caufes be intirely confumed in producing 
thofe Effefts. 
This their Opponents do not admit, unlefs in the 
Cafe where thofe equal Effe&s are produced in equal 
Times : And therefore, till both Sides fhall agree in 
admitting 
