BY the death, on February 27, of ALFRED J. MOSES, professor of mineralogy at Columbia University, the science of mineralogy has lost (says “H. P. W.” in Science) one of its most eminent and valued exponents. Prof. Moses's work as a teacher, as a writer, and as a scientific investigator can scarcely be too highly esteemed, and his loss to all branches of his profession is most keenly felt. His text-book on “Mineralogy, Crystallography, and Blowpipe Analysis “will for many years remain the standard in a large majority of the universities in which courses in these subjects are given. His work on uThe Characters of Crystals,” published in 1899, is the first treatise published in America upon physical crystallography, a branch of crystallography which was early recognised by him as of primary importance to chemists, geologists, and mineralogists, and has within very recent years assumed a scope and developed practical applications which have more than justified his early visions of its future.