( '99 ) 
Mr. Leibnitz , by the Help of Dr. Barrow's Method of Tan- 
gents, to colled: it from thole Letters. And its certain, by 
the Arguments above-mentioned, that he did not know it 
before the writing of thofe Letters. 
Dr. Wallis had received Copies of Mr. Menton's two Letters 
of June 13. and Ottob. 24. 1676 from Mr. Oldenburgh, and 
publifhed feveral things out of them in his Algebra , printed 
in Englifh 1683 , and in Latin 1 69 3 ; andfoon after had Inti- 
mation from < Holland to print the Letters entire, becaufe 
Mr. Menton’s Notions of Fluxions palled there with Applaufe 
by the Name of the Differential Method of Mr. Leibnitz 
And thereupon he took notice of this Matter in the Preface 
to the firft Volume of his Works publifhed A. C. 1695. And 
in a Letter to Mr. Leibnitz dated Decemb. 1. 1 696, he gave the 
Account of it. Cum Pr&fationis ( prafigend<e) poflremum folium 
erat fub pralo, ejufque typos jam pofuerant Typothet £ ; me monuit 
amicus quidam {bar urn rerum gnarus ) qui peregre fuerat, turn ta- 
lem metbodum in Belgio prtdicari, turn illam cum Newtoni me- 
tbodo Fluxionum quafi coin cider e, Quod fecit ut (tr an flat is 
t'jpis jam pofitis ) id monitum interferucrlm . And in a Let- 
ter dated April 10. 1695, and lately communicated to 
the Royal-Society, he wrote thus about it. I wi(h you would 
print tbe two large Letters of June and Augufl: Che means June 
and Offober] 1 676. I had intimation from Holland, as defir ed 
there by your Friends , that fomewbat of that kind were done ; be - 
caufe your Notions {of Fluxions) pafs there with great Applaufe by 
the Name of Leibnitz’* Calculus Differentials. I had* this 
intimation when all but part of the Preface to this Volume was 
printed off ; fo that / could only infert ( while the Prefs flay’d ) that 
(bort Intimation thereof which you there find, Tou are not fo kind 
to your Reputation (and that of the Nation ) as you might be, when 
you let things of worth lye by joufo long t till others carry away 
2, 
* Extathaec Epiftola in tertio volumine operum Wallifti. 
K k z the 
