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ILLUSTRATIONS.

Firs. 1-2.-Crystals of sodium trimetaphosphimate...

3-4.-Crystals of tri-silver trimetaphosphimate..
5-6.-Crystals of tri-silver diimidotriphosphate..

7.-Crystal of hexaphosphonitrilic chloride.

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DEPARTMENT OF THE INTERIOR,
UNITED STATES GEOLOGICAL SURVEY.

Washington, D. C., November 4, 1899, Sir: I submit herewith a manuscript entitled Contributions to Chemistry and Mineralogy from the Laboratory of the United States Geological Survey. I have the honor to request that it be published as a bulletin of the Survey. Very respectfully,

F. W. CLARKE,

Chief Chemist. Hon. CHARLES D, WALCOTT, Director United States Geological Survey.

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