L J 9 ] Page 184, line 20, after England, It is there found with the ironftone and man- 'ganefe, but in fmall quantities. ■ Like wife at Zellerfeld 011 the Hartz. After line 25, c. Saphire coloured. Was once found, together with fonre white lead-fpar, at Wendijh-Leuten, and melted by the blowing-pipe. D. Jac- quin has this curiofity in his cabinet, and prefented me with a cryftal of it. d. Red. Found in the mines of Pirofew, near Catharinenburg in Siberia. e. Black. Is found, very feldom, in Saxony. The figure of thefe cryftals is not always the fame. The white ones come near the figure of felenites; the green and the black ones from Saxony, and the blue ones from Hungary, are prifmatick; the red Sibe rian ones are perfeftly rhombic, and the green Bohemian ones form cubes. Their colour depends on the adventitious particles in them. Lehman has found fulphur and arfcnick in the red ones; the others have not • been fufficiently inveftigated; molt of them elfervefce with acids. Page 185, after line 22, c. Mixed with a confiderable portion of calca reous earth. Miner a calciformis mixta terra calcar ea majori pcrtione. This is what our author has already de- fcribed, Seft. XXXVII. and XXXVIII. It efFervefces with aquafortis, and holds 40 per cent, lead, on which account, it ought rather to be placed here than among the calcareous earths. M.Cronftedrfounded hisclaffificarion C 2 upon