THE POPULAR SCIENCE MONTHLY 



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 medica- 

 tion on the diseased cell, and logically to the 

 conclusion that small doses are to be pre- 

 ferred. The present work is the outgrowth 

 of personal experience in practice, and it is 

 adapted to use with the pocket case. It con- 

 tains a list of remedies, with the diseases to 

 which they are suited, and a therapeutic in- 

 dex 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 con- 

 cise and yet explicit account of the methods 

 of solving them. It is intended to form a 

 part of the course of teaching or study suita- 

 ble 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 sum- 

 mary of chemical facts or processes is given 

 before explaining methods ; and the ex- 

 planations 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 labora- 

 tory teacher and a lecturer on certain special 

 branches of chemistry, and brings the re- 

 sults 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 HempeVs 

 Methods of Gas Analysis, made by Prof. L. 

 M. Dennis, of Cornell University, is published 

 by Macmillan & Co. It has been the pur- 

 pose 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 meas- 



urement of gases is there brought into use 

 In the translation, which has been made 

 with the personal co-operation of Prof. Hem- 

 pel, 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 de- 

 termination of the hydrocarbon vapors has 

 been inserted. Price, $1.90. 



In the treatise of R. Lovett and C. Davi- 

 son on The Elements of Plane Trigonometry, 

 the subject is divided into three parts, deal- 

 ing, respectively, with arithmetical, real al- 

 gebraical, and complex quantity. Such an 

 arrangement appears to the authors to be a 

 natural one, and has the advantage of intro- 

 ducing the new names and formulae that be- 

 long to the subject before the student en- 

 counters 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 Ques- 

 tion Compends (W. B. Saunders, Philadel- 

 phia), by Dr. Frederick J. Brockncy. 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 (Macmil- 

 lan, $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 



