is8 Mifcellanea Curiofa. 



Some Illujlrious Specimens of the 

 ^Ooclrme of Fluxions ; or Ex* 

 ambles by isuhtch is clearly 

 *Jbe<wn the Ufe and Excellency 

 of that Method in folving Geo- 

 metrical "Problems. 



By Ab. De Moivre. 



YOU have here alio the Method which 

 I promis'd, concerning the Quadratures 

 of Curvilineal Figures, the Dimenfion of 

 the Solids generated by the Relation of a 

 Plane (and of the Surfaces) the Rectification 

 of Curve Lines, and the Calculation of the 

 Center of Gravity. I know thefe Points 

 have been already handled by feveral very 



learned Men —But I hope this At* 



tempt of mine will neverthelefs not alto- 

 gether difpleafe, if (efpecially) I have had 

 the good Luck to find a fnorter and more 

 expeditious way to thefe things, than what 

 is commonly known. 



But before I proceed farther, I would 

 have it obferv'd, that I make ufe here, of 

 what the celebrated Mr. Newton has de- 

 monftrated, Page 251, 252, 253. Trine. Phil. 

 concerning the Moment aneous Increments or 

 Decrements^ of Quatnities that Increafe or Xte- 



creafe 



