THE author states in the preface, that the arrangement of the course of elementary instruction in chemistry, which is given in this book, is based on the periodic classification of the elements. The properties of four elements, hydrogen, oxygen, nitrogen and carbon, and the properties of many compounds of these elements, are considered before the systematic study is entered on, of the groups into which the elements are divided by the application of the periodic law. Then follow chapters wherein the members of the various groups of elements, and the chief compounds of these elements, are described. To this descriptive part of the book are prefixed fifteen chapters of “introductory outlines,” constituting “a brief sketch of the fundamental principles and theories upon which the science of modern chemistry is built.” In his directions to students using the book, the author says that a start should be made by reading carefully the chapters dealing with chemical change, elements and compounds, nomenclature, and symbols; that the four typical elements—hydrogen, oxygen, nitrogen, and carbon—should thenbe studied; and that, as this study is proceeding, the remaining chapters of the “introductory outlines” should be mastered. A Text-book of Inorganic Chemistry. By G. S. Newth Pp. xiii. 667. (London: Longmans, Green, and Co., 1894.)