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 the end of this floor. The usual employment of this place was plain enough, even to me with only college course knowledge of chemical matters. Here were the laboratories for experimentation and research where a commercial firm, such as Stamby-Temke, would keep a covey of chemists testing their products, analyzing the goods of competitors and making experiments to improve their own formulæ for colors, caustics, preservatives, antiseptics, poisons, solvents, reagents and what not.

Most of these tests would be simple enough and involve no danger to any one; but some would generate gases, poisonous or otherwise noxious, which should not be allowed in an open room; therefore the firm had installed, at the end of this laboratory, a special compartment which was, beyond any doubt, "the glass room."

Its outer wall was not of glass; rather, it was not all glass, though there were two windows in it. No blinds were drawn before them but they were black from the steel shutters outside. The other three walls were of glass from floor to ceiling and, as the normals brought us nearer, I could see that the glass was heavy, clear plate such as is used in show windows and that it was carefully and evenly joined in steel framing.