ent one deals with ecolloinic i~linerals strictly, exclusive of metallic ores, and in the main of precious ancl ornamental stones. The plan of the work is good, and the geological element in i t is valuable; but the treatment is very unequal, some portions being well and fully presented, and others but inadequately. The work bears no date, and takes no note of soine important recent developments, e. g., that of monazite and the related rare earths. Its chemical formulas, too, are not modern. As

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... a whole, the book is of interest in its suggestion of what might be, if the author's ideas were carried out more fully and comprehensively, errors and omissions corrected, and the treatment brought up to date.