( ii8 ) 
Book of Principles here referred unt#, Mr. Newton did not 
acknowledge that Mr. Leibnitz, found this Method without 
receiving Light into it from Mr. Newtons Letters above-men- 
tioned j and Dr. Wallis had lately told him the contrary 
without bang then confuted or cofitradi&ed. And if 
Mr. Leibnitz had found the Method without the Affiftance 
of Mr. Newton, yet fecond Inventors have no Right. 
Mr. Leibnitz* in his aforefaid Anfwer to Mr. Fatio, wrote 
further: Certe cum element a Calculi mea edidi anno 1684, ne 
conflabat quldem mihi aliud de invent is ejus [(c* Newtonfj in 
hoc gene re , quam quod ipfe oltm fignifi caver at in liter is, pojfe fe 
Tangent es invenire non fublatis irrationalibus, quod Hugenius 
quoque fe pojfe mihi fignificavit pojtea, etfi caterorum ejus Calculi 
adhuc expers. Sedmajora multo confecutum Newtonum, vifo 
demum libro Principiorum ejus, fatis intellexi. Here he again 
acknowledged that the Book of Principles gave him great 
Light into Mr. Newtons Method : and yet he how denies 
that this Book contains any thing of that Method in ir. 
Here he pretended that before that Book came abroad he 
knew nothing more of Mr. Newton's Inventions of this kind, 
than that he had a certain Method of Tangents, and that by 
that Book lie received the firft Light into Mr. Newtons Me- 
thod of- Fluxions .* but in his Letter of June % 1.1677 he" 
acknowledged that Mr. Newtons Method extended alfo to 
Quadratures of curvilinear Figures, and was like his own. 
His Words are ; Arbi tr or qua celare voluit Newtonus de Tan • 
gentibus ducendis ab his non abludere. Quod addit, ex hoc eo- 
dem fundament 0 Qua dr at ur as quoque reddi faciliores me in fen - 
tentia hac confirmat ; nimirum femper figura ilia funt quadrabi- 
le.s qua funt ad a.quationem different ialem. 
Mr. Newton had in his three Letters above-mentioned 
( copies of which Mr. Leibnitz had received from Nit. Olden- 
bergh) reprefented his Methocl fo general* as by the Help of 
Equations, finite and infinite, to determin Maxima and Mi- 
nima, Tangents, Areas, folid Contents, Centers of Gravity, 
z ■ Lengths 
