In a continuation of our study of volcanic augites, we have recently examined an augite from the Alban Hills, using material sent to us by Professor F. Millosevich, of the University of Rome, to whom we would express our sincere thanks. The material studied by us was used also by Drs. L. H. Adams and E. D. Williamson, of the Geophysical Laboratory, in their investigation of the compressibility of minerals and rocks.1

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