PORRETT

Robert (son of Robert Porrett). b. London 22 Sept. 1783; a istant to his father, the ordnance storekeeper at the Tower of London 1795, chief of the department, retired on a pension 1850; F.S.A. 9 Jany. 1840; F.R.S. 9 June 1848; F.R.A.S.; an original fellow of Chemical society 1841; contributed several papers on armour to Archæologia and Proceedings of Soc. of Antiquaries; awarded a medal by Society of Arts for discovery of pru ous acid 1808, which he termed sulphuretted chyazic acid in 1814; discovered ferrocyanic acid, which he named ferruretted chyazic acid; discovered electric endosmosis 1816; author of 13 scientific papers. d. 49 Bernard st. Ru ell sq. London 25 Nov. 1868. Proc. of Royal Soc. xviii p. iv (1870).