334 Sydneian Genus. Mr. Klaproth, 4,615. According to Werner, 4,7. 2 Bergm. Journ. 1790, 90. Heated to rednefs, and quenched in water, it becomes rifty, and troubled. According to Mr. Geyer, it is fcarcely fufible, even by the help o f pure air. It is infoluble in acids, except by particular management. By the analylis of Mr. Klaproth *, 1.00 parts ofit contain, 31,5 filex, 5 of ferruginous nickel, and 68 of a new earth. EIGHTH GENUS. Sydneia. OF this no fpecies has as yet been foundj nor has it been deteöed in any other ftone. * Briflbn, p. 73.