SIR, Your most obedient Servant, R. Franklin. London, Dec. 21, 1757. LX. _Observations on the late Comet in_ September _and_ October 1757; _made at the_ Hague _by Mr._ D. Klinkenberg: _In a Letter to the Rev._ James Bradley, _D. D. Astronomer Royal, and F.R.S. and Member of the Royal Academy of Sciences at_ Paris. _Translated from the_ Low Dutch. [Read Jan. 12, 1758.]