Excerpt from The Action of Ammonium Chloride Upon Silicates
Department OF the interior, united states geological survey, Washington, D. September 26, sir: I have the honor to transmit herewith a memoir by Messrs. Clarke and Steiger on the action of ammonium chloride upon sili... cates, with the recommendation that it be published as a bulletin. These researches are of great geological importance for the light they throw upon the rational constitution of minerals. They are based on a method which is wholly novel and which is capable of wide applica tion. The work is most creditable to the authors and to the United States Geological Survey. Very respectfully, your obedient servant, george F. Becker, Geologist in Charge, Division of Chemical and Physical Research.
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