66 v Fufibility. Silex, Magntfia, and Argiü. yet, quere; for, af- iee Berl. Mem. 1780, Calx, drgill, and Silex. terwaras, ne auows it to have melted f3 calx 1 jJ 3 argill I 1 filex ( 3 ca! * green g’aft., A 4 1 argill green glaft. A 4 2 argill {_ 1 filex i 1 filex j 3 calx friable rtiafs, porous eoamel. 3 calx