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Weight into the Velocity; and the other. That it is 
the Product of the Weight into the Square of the 
Velocity. 
This Controverfy was firft flatted by the famous 
Mr. Leibnitz , and has been carried on by him and 
his Followers for near threefcore Years; during 
which Time a great Number of Pieces have been 
publifhed on both Sides of the Queftion, and a great 
Number of Experiments have been made, or pro- 
pofed to be made, in order to decide it. But tho’ 
both Parties agree in the Event of the Experiments, 
whether adually made, or only propofed ; yet, as 
the Writers on each Side have found a Way of de- 
ducing from thofe Experiments a Conclufton fuit- 
able to their own Opinion, the Difagreement ftill 
continues as wide as ever, to the great Scandal of 
the Learned World. 
Now, if we examine carefully into the Reafon of 
this, and would fee by what means it happens, that 
two oppofite Conclulions are fo often drawn from 
the fame Experiment, we fhall find it not fo much 
owing to falfe Reafoning on either Side, (That would 
be eafily deteded, and fet right), a$ r to another Caufe; 
namely, to their Difagreement in the Principles upon 
which the Reafoning is founded. 
For, whereas whatever is laid down on either Side 
as a Principle, ought to be fomething all the World 
agrees in, at leaft what is admitted by the other Party ; 
without which, all Reafoning upon it is to no Pur- 
pofe ; this Condud has been fo little obferved in 
the prefent Difpute, that what has been offered on 
the one Side as an undoubted Principle or Axiom, 
has 
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