56 REVIEWS. 



ena of light which enable the reader intelligently to understand lenses 

 and their uses in optical instruments. 



Methods of measuring light and the standards used in these measure- 

 ments are concisely stated in the chapter on Photometry and Illumination. 

 Many suggestions are given in this chapter for the proper illumination 

 of rooms, halls, etc. The chapters on Reflection and Refraction, Dis- 

 persion and Spectrum Analysis, Interference and Diffraction, Polariza- 

 tion and Double Refraction, are dealt with in their logical order in a brief 

 and satisfactory manner. 



The last six chapters of the book are on Sound. As the author's state- 

 ment clearly indicates, the treatment of the subject is "abbreviated to 

 the utmost and the discussion is limited to those things which are of 

 practical importance." The chapters, The Physical Theory of Music, 

 and Miscellaneous Phenomena Depending upon the Reflection, Refraction 

 and Diffraction of Sound and Architectural Acoustics, are interesting 

 and practical. 



The book would seem to fill the authors' ideal of making the subject 

 interesting, but to the mind of the reviewer it would serve better as an 

 auxiliary reading book in physics than as a text-book. There are many 

 references, principally to the standard books on physics, given in the 

 text. The typography, illustrations and printing are good. A poor 

 quality of paper, however, has been used. 



R. P. B. 



An Introduction to Chemical Analysis for Students of Medicine, Pharmacy and 

 Dentistry. By Elbert W. Rockwood, M. D., Ph. D. Third edition, revised, 

 with 20 illustrations. Cloth. Pp. xiii-247. Price, $1.50. Philadelphia: P. 

 Blakiston's Son & Co. 



The greater prominence given to the ionic explanations of analytical 

 reactions is practically the only change over the preceding editions and 

 constitutes the most commendable feature of the text. 



It is the belief of the reviewer that elementary instruction in quali- 

 tative volumetric analysis has no ligitimate place in the professional 

 schools of medicine, pharmacy, or dentistry. 



The subjects under Applied Analysis, viz, Waters and Blowpipe 

 Analysis and Detection of Poisons, are well chosen, but are altogethei 

 too briefly treated to be of great value. 



G. P. R. 



