1448
J. N. BRdNSTEn.
the final precipitation; and that vanadium would require special treatment. Since this element has not been reported in zirconium ores, and since its presence in significant amounts would be indicated a t various stages of the analysis, it would cause no trouble. The authors desire to express to Dr. W. F. Hillebrand of this Bureau their sincere appreciation of his aid and counsel. WA~EIWQTON, ry c. -
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