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Eudialyte.-As long ago as 1861 Professor O. U. Shepard * discovered small nodules of a biilliant crimson mineral in the feldspar of the elreolite rock of Magnet Oove, Arkansas. He at first supposed this mineral to be corundnm, but after testing its hardness (which he found to be less than 6'), and observing that it gelatinized with hydrochloric acid, he decided that it was eudialyte. From that time the occurrence of this mineral in Arkansas has been mentioned in most text-books of mineralogy t on Professor Shepard's authority, but not until very lately has the subject been revived. During the last year William J. Kimzey of Magnet Oove has found a number of good crystals and also a considerable quantity of the nodular material. Hidden and Mackintosh have published a note in this Journal,:!: in which they describe this nodular, rose-red, nearly transparent mineral, and state that it is probably eudialyte, and identical with that discovered by Shepal•d.