or without t h e persulfate treatment for steels of over 0. j o per cent carbon.T h e ferrous ammonium sulfate solution m a y be standardized against 0.1 N perrnanganatc, the strength of which has been determined with sodium oxalate. T h e iron value of the permanganate multiplied b y 0.917 gives the vanadium value. By this method t h e following results were obtained, the chromium in expts. 9, I O , 13 and 14 being added as KzCrlOl before the solution of the steel.T h e following steels were employed:-U. S . Bureau of Standorde Sample h70. 24, containing 0.15 per cent B-U. S. Bureau of Standards Sample No. 30, containing 0.21 per cent C-A steel casting confaning 0.2 IS per cent V. 0.30 per cent C. and no Cr. D--A plain steel containing 0.85 per cent C. V. 11.35 per cent C. and a trace of Ci. V. 0.37 per cent C. and 1.35 per cent Cr. Ti-'1 plain steel cootnining 1.25 per cent C.
Early in 1914 a parcel of copper-nickel-cobalt ore, weighing several tons, was received in London for valuation from the 'Cármenes mine, Spain'. This somewhat vague statement of locality refers without doubt to the group of mines in the district of Cármenes, province of León, situated about 6 km. E.N.E. of Viilamanín, a statisn on the railway from Gijon to León and about 40 km. N. of the latter city. The ores of these mines are described as consisting of sulphide minerals of copper, cobalt, and nickel in a gangue of dolomite.
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