1 Cupric chloride, 1 g.; magnesium chloride, 4 g.; hydrochloric acid, This reagent deposits copper 1 cc.; water, 20 cc.; absolute alcohol, 100 cc. upon the areas lowest in phosphorus. The writer has read with interest the papers on the analytical control of ammonia oxidation by FOX,^ 1 J. Iron and Steel Inst., 97 (1918), 296. 2 Carnegie Scholarship Memoirs, Iron and Steel Inst., 3 (1911), 304. 8 I t is not considered probable that oxides of iron and manganese can exist in solution in manganese

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... ulfide, in quantities greater than the merest traces. The following reactions would certainly occur at high temperatures: 2Fe0 + MnS + Mn -4-2Fe + SOz 2 M n 0 + MnS -3 3Mn -4-SOz 4