An investigation of the silica deposits of southern Illinois . 31. Curves 5hovuino th£ Differences IN THE Rate^ of Inversion of the Materials ith the Same Bond/ncAgent Bonding Agent- Co S 0^ White Silica No. Iffl? Oannister NoZ No VACULI TE^^d^O- 3 rZ4Q Q:O 5 Q: o UiUJ 4^- Temperature in Cones .^Lj-^ , 11,. I i: ..Ill

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectminesandmineralresou