An answer to the letter of Mr. Keyser, [electronic resource] : surgeon and chemist of Paris. In which the insufficiency of his medicine, for the cure of the venereal disease, is further considered. Also, some evidences of the anonymous author of the parallel are produced, and confirmed by the testimony of M. Faber, President of the Company of Surgeons, and Counsellor to the Committee of the Royal Academy of Surgery in Paris. By Jonathan Wathen, Surgeon.