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274 which they depend. Having acquired this knowledge by studying the pathological changes occurring in disease, we endeavor to discover remedies which, by their known physiological actions, would be calculated to arrest or counteract those changes. This leads to the study of the effect of medication on the diseased cell, and logically to the conclusion that small doses are to be preferred. The present work is the outgrowth of personal experience in practice, and it is adapted to use with the pocket case. It contains a list of remedies, with the diseases to which they are suited, and a therapeutic index of diseases with reference to the remedies prescribed for them. (D. Appleton & Co., publishers.)

A hand-book on Chemical Calculations (New York: Longmans, Green & Co., 60 cents) has been prepared by Mr. R. Lloyd Whiteley, to supply a need for a work giving, besides a fair selection of problems, a concise and yet explicit account of the methods of solving them. It is intended to form a part of the course of teaching or study suitable to the chemical student who wishes to prepare himself for whatever duties in his line he may be called upon to perform, and is also an aid to examinations. A short summary of chemical facts or processes is given before explaining methods; and the explanations concern methods of calculating the results of specific gravity determinations, of analyses of all kinds, and of atomic and molecular weight determinations, and are brought up to date. The author is a laboratory teacher and a lecturer on certain special branches of chemistry, and brings the results of his experience and of his intercourse with students to aid in his work. Prof. F. Clowes furnishes the preface.

A translation of Dr. Walther Hempel’s Methods of Gas Analysis, made by Prof. L. M. Dennis, of Cornell University, is published by Macmillan & Co. It has been the purpose of the author, omitting the complete description of known methods, which would make the book too bulky for a laboratory guide, to describe his own researches and the construction of apparatus, and all the operations which are involved in the analysis of gases with his apparatus. The apparatus devised by Pettersson has been described because a wholly new principle in the measurement of gases is there brought into use In the translation, which has been made with the personal co-operation of Prof. Hempel, the chapter upon the determination of the heating power of fuel has been largely rewritten, with the introduction of new cuts of the latest forms of apparatus, the chapter upon the analysis of illuminating gas has been changed, and a new method for the determination of the hydrocarbon vapors has been inserted. Price, $1.90.

In the treatise of R. Lovett and C. Davison on The Elements of Plane Trigonometry, the subject is divided into three parts, dealing, respectively, with arithmetical, real algebraical, and complex quantity. Such an arrangement appears to the authors to be a natural one, and has the advantage of introducing the new names and formulae that belong to the subject before the student encounters the difficulty of the application cf signs to denote the sense and direction of lines. The work differs mainly from those most generally read in the extent to which the treatment adopted by Prof. De Morgan, the influence of whose writings appears throughout it, has been followed. Abundant examples for exercise have been collected from university and other examination papers. Published by Macmillan & Co. Price, $1.60

A book on the Essentials of Physics has been added to the series of Saunders's Question Compends (W. B. Saunders, Philadelphia), by Dr. Frederick J. Brockney. It has been prepared especially for students of medicine, and is intended to be a compromise between such books as Ganot's, which is found too large to be used as a text-book, and some elementary books on the subject which do not contain all that is necessary for the student to know. The questions are classified as On Matter and its Properties—Solids, Liquids, and Gases; On Heat; On Light; On Sound; and On Magnetism and Electricity. Price, $1.

Mr. David Denning's hand-book on The Art and Craft of Cabinet-making (Macmillan, $1.50) will be welcomed by amateurs and young craftsmen, and even experienced workmen may derive pleasure and profit from it. It relates to the construction of cabinet furniture, the use of tools, the formation of joints, etc., explaining the ordinary reliable methods of the workshop, but not exploiting