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^[[7 7/8]] Dear Mr. Wilson; Yours of the 4th with specimens received. The material is halloysite, a hydrous aluminum silicate allied to kaolin. The sample is very similar to the so-called "Indianite" of Cox, found in St. Lawrence County, Indiana, where it occurs as a residue from the decomposition of the limestone. From what you write I judge this originates in the same way. Get a few pounds of it for us, as clean as nature allows. Trusting you are having a picnic, I am, ^[[exclamation point]] Very Truly Yours, Curator Dept. of Geology.