By Earle R. Caley

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Place one drop ( 0 0 5 ml) of the solution in the cavity of a cupped electrode of spectrographic carbon and dry in an oven at 100°C for about 15 min. The results are somewhat more satisfactory if the cup of the electrode is waxed beforehand to prevent penetration of the solution. To do this, place a drop of a 5 per cent solution of carnauba wax in carbon tetrachloride in the cup and heat in an oven at 100°C for about 5 min. Evaporate the solution in the cup in the same way as before. Place a pointed electrode of spectrographic carbon above the charged electrode and complete the examination as in (a).

I l l , L o n d o n , pp. 35, 323, 511 (1923). ΛΛΜ-D chemistry\ 38 ANALYSIS OF ANCIENT METALS measurement, each of these units being 0· 1. On the average, therefore, a little more than 1 per cent is the closest approach that can be attained in respect to the composition of such alloys by this method. Actually, if no contraction or expansion occurs on alloying, each change of 0-1 in specific gravity represents a little more than a 0-5 per cent change in composition near the top of the range in gold content and about 2 per cent change near the bottom of the range.

Dilute to 2 ml. Place one drop ( 0 0 5 ml) of the solution in the cavity of a cupped electrode of spectrographic carbon and dry in an oven at 100°C for about 15 min. The results are somewhat more satisfactory if the cup of the electrode is waxed beforehand to prevent penetration of the solution. To do this, place a drop of a 5 per cent solution of carnauba wax in carbon tetrachloride in the cup and heat in an oven at 100°C for about 5 min. Evaporate the solution in the cup in the same way as before.

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