Leibniz demanded a retraction saying that he had never heard of the calculus of fluxions until he had read the works of Wallis . Keill replied to Leibniz saying that the two letters from Newton, sent through Oldenburg, had given:
Leibniz hinihingi ng isang pagbawi sinasabi niya na hindi naririnig ng calculus ng fluxions hangga't hindi niya basahin ang mga gawa ng Wallis. Keill tumugon sa Leibniz kasabihan na ang dalawang titik mula sa Newton, na ipinadala sa pamamagitan ng Oldenburg, had given: