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Fujibitity, MifceUantous Experiments, 40 argill 25 filex 20 aerated calx ' 1,3 highly calcined iron 46 argill 39 filex § aerated ca'x 6 highly calcined iron 41 argill 34 filex 20 ruft of iron 46,66 filex 48,5 magnefia 4,75 ruft of iron 43 filex 22 magnefia 34 ruft of iron 67 filex 14 argill 11 barytes 8 magnefia 65 filex 32 argill 2 calx of iron 43 filex 37 ar S il1 j,7 calx 4 calx of iron barely coalefced at 144° into a grey mafs, glazed on the furface. Same mixture, with the fubftitution of 13 calx of iron, inftead of 1,3, which is the hyacinth of Bergman, melted at 144* into a reddifli porous flagg. Saxon topaz of Bergman, melted ► at 144 into a greyifli flightly po- rous porcelain mafs. fjhorl of Wiegleb melted at 148 ! ' into a porous black flagg, with a ftrong metallic appearance. ])*, with highly calcined iron, . formed a greenifli black porous I flagg, ill meited. 'afießos of Wiegleb, a reddifli yel low, fomewhat indurated, powder, exccpt where it touched the cru- cible, which it corrodrd at 148. the aflinolite, or Strahl ftein, of Wiegleb, melted into a greyifli black, fomewhat parom and fi- brous, mafs, perftüly opake, at 148. felfpar, by my analyfis, melted at ^148 into a white porous enamel. felfpar of Wiegleb refufed to melt ^even at 158, and barely hardened. felfpar of Sauffure refufed to melt •at 140, formed a hard porous mafs.