. . .. .. ... 427 Р III. Nonmetallic Refractory Materials .................... 427 Р Final Review of Observations and Report ......................... 428 РAppendix ......................................................... , 430 Р Test Solutions ................................................ 430 Р Preparation of Unknowns .............................. ~ ...... 431 Р Reagents .................................................... 432 Р Table 1. Color of Some anic Substances ................... 432 Р Table 2. Substances Crystallizing in the Cubic System ........... 433 Р Elements ... . . . . . . . . . . . . . . . . . . . •. . . . . . . •. . . . . . . . . . . .. 433 Р pounds. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 433 Р pounds .. , ................................ 435
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