VOL. XXX.] PHILOSOPHICAL TRANSACTIONS. 389 



calpen^ to distinguish it from the other Carteia in Celtiberia, mentioned in 

 the 21st book and 5 th chapter of Livy. 



I am very much surprised that Mariana, and several others, should take the 

 present Gibraltar to have been the ancient Heraclea ; when neither Pliny, who 

 resided so long in those parts, Mela who was born there, nor any ancient 

 geographer or historian that I have met with, makes the least mention of such 

 a city thereabouts, except Strabo; and he places it 40 stadia from Calpe, at the 

 foot of which Gibraltar is situated. The Spanish historians give good ground 

 to believe there was no town upon that mountain till the Moors invaded Spain 

 under Tariff, who gave it the name it has retained ever since. 



A Letter of M. VAhbe Conti, F.R.S. to the late M. Leibnitz^ dated at London, 

 in March 1 7 1 6, concerning the Dispute about the Invention of the Method 

 of Fluxions, or Differential Methods with M. Leibnitz s Answer. N° 359, 

 p. 923. Translated from the French, 



I have hitherto deferred answering your letter, as I wished to accompany 

 my answer with that of Mr. Newton made to I'Apostille, here added. I shall 

 not enter into particulars as to your dispute with Mr. Keill, or rather with 

 Mr. Newton. I can only relate historically what I have seen, or what I have 

 read, to form a proper judgment of the matter. 



I have read, says the Abbe, with the greatest attention, and impartiality, 

 the Commercium Epistolicum, and its extract published in Phil. Trans. N"342. 

 I have seen the original letters of the Commercium in the custody of the Royal 

 Society, a short letter (dated March 17, 1693, and printed at the end of 

 Raphson's history of flu-xions) in your own hand-writing to Sir Isaac Newton, 

 and the old manuscript, entitled, Analysis per series numero terminorum infi- 

 nitas, sent by Sir Isaac Newton to Dr. Barrow, and published by Mr. Jones : 

 from all which I conclude, that retrenching every thing that is foreign to the 

 dispute, the only question seems to be, whether Sir Isaac Newton had the 

 method of fluxions, or the infinitesimal calculus, before you, or you before Sir 

 Isaac Newton. It is true, you were the first who published it; but you ac- 

 knowledged, that Sir Isaac Newton had given considerable hints of it in the 

 letters he wrote to Mr. Oldenburg and others, as is shown at great length in 

 the Commercium, and its extract. What are your answers then to all this? 

 This is what the public still wants, in order to form an exact judgment of the 

 affair. 



Your friends expect your answer with great impatience, and they think you 

 cannot dispense with returning an answer, if not to Mr. Keill, at least to Sir 



