In the preparation of samples for analyses while engaged in an investigation of the zeolites of Nova Scotia, the writer learned that Sonstadt’s mercuric potassic iodide solution may not be used either for separations or for specific gravity determinations in the case of some of the zeolites, owing to the readiness with which the minerals are changed by the substitution of potash for soda and lime, accompanied by a large loss of water and an increase in density.

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