November 23, 1900.] 



SCIENCE. 



803 



the delicate instruments employed, conduct of 

 the work of collecting data, method in detail of 

 working up results from the logs and indicator 

 diagrams, and methods of adjustment of system 

 of test to character of engines and boilers in 

 hand. 



A second part presents the details of tests of 

 simple, compound and triple expansion engines, 

 summaries of the work, and a review in which 

 are given his deductions as to magnitude and 

 character of internal thermal wastes, effects of 

 varying engine-speeds, steam-pressures, super- 

 heating, condensing, and the relative values of 

 the types of engine described, effects of steam- 

 jacketing and of reheating in multiple-cylinder 

 engines and of variations of proportion. The 

 pressure diagrams taken with the indicator from 

 the steam-chest or the steam-pipe of the engine 

 constitute a rare collection of useful data. 

 Sample indicator-diagrams are given from all 

 the engines and are admirably reproduced by 

 the engraver. The book is printed upon heavy 

 calendared paper and is a good piece of work. 



The deductions and conclusions of the author 

 are likely to be very helpful to the practitioner 

 and there still is left for the reader the oppor- 

 tunity to study out many interesting, and some 

 valuable, practical and scientific facts, laws and 



important conclusions. 



R. H. Thurston. 



Experimental Chemistry. By Lyman C. Newell, 

 Ph.D. (Johns Hopkins), Instructor in Chem- 

 istry in the State Normal School, Lowell, 

 Mass. Boston, D. C. Heath & Co. 1900. 

 Price, $1.10. 



The aim of this book as expressed in the pre- 

 face is ' to provide a course in chemistry which 

 shall be a judicious combination of the induc- 

 tive and deductive methods. ' The author has 

 selected representative experiments and has 

 left many of the properties, of the substances 

 experimented with, to be determined in the 

 laboratory by the student. A number of simple 

 quantitative experiments and problems are 

 given and several features are added which 

 give considerable choice in the selection of 

 topics for discussion. A number of subjects, 

 suggested by the experiments, are given for 

 discussion in the laboratory and a number of 



classroom exercises, in the shape of subjects 

 concerning the historical and descriptive side 

 of chemistry, suggest different phases of the 

 science upon which emphasis can be laid. The 

 book "is clearly written and the explanations 

 are sharp and to the point, and it will no doubt 

 prove of value in normal schools and colleges. 

 A teachers' supplement accompanies it. 



J. E. G. 



The Arithmetic of Chemistry. By John Wad- 

 dell, B.So. (London), Ph.D. (Heidelberg), 

 D.Sc. (Edin.), formerly assistant to the Pro- 

 fessor of Chemistry in Edinburgh University. 

 New York, The Macmillan Co. 1899. Pp. 

 136. 



This book is intended to assist students in 

 overcoming the difficulties they encounter in 

 making chemical calculations. After describing 

 the methods of calculating simple and complex 

 weight relations, the author devotes chapters 

 to the volume of gases, calculations involving 

 weight and volume, calculations of analytical 

 analysis and of formulte. An appendix con- 

 tains tables which may have to be consulted in 

 making the calculations. In each chapter the 

 principle is clearly explained by a number of 

 examples, and a variety of problems taken 

 from examination papers of different universi- 

 ties are given, which can be solved by the 

 student. One who has worked through this 

 book should have a good grasp of the principles 

 involved. 



J. E. G. 



Die Chemie im taglichen Leben. Von Profbssok 

 Lassae-Cohn. Vierte Verbesserte auflage. 

 Hamburg, Leopold Voss. 1900. 4 Marks. 

 Few popular works on chemistry have earned 

 recognition in as short a time and in such 

 degree as this. Not a text-book, its popularity 

 is solely due to its acceptance by the general 

 reader. The first edition appeared in Decem- 

 ber, 1895, an English translation by M. M. Pat- 

 terson Muir, with title, ' Chemistry in Daily 

 Life,' being published shortly after by the J. 

 P. Lippincott Co. Since then a Russian and an 

 Italian translation have appeared, and also a 

 second English edition, while translations into 

 Servian, Portuguese, Bohemian, Swedish and 

 Polish are announced. 



