Notices respecting New Books. 575 



copious supply of examples interspersed in the text and given at 

 the end of the book. By the aid of these, a student may always 

 check his progress and make sure of having mastered each con- 

 secutive section of the work. Another highly commendable 

 feature is the easy gradation by which the student is led up from 

 the comparatively simple to the highly complex parts of the 

 subject. The early chapters deal with kinematics, the laws of 

 motion, impact, circular motion, work and energy. Then comes 

 a chapter on central forces and orbits, followed by one on con- 

 strained motion and motion in a resisting medium. A consideration 

 of general dynamical principles precedes the discussion of the 

 motion of a rigid body. Then comes what is probably the most 

 difficult chapter in the book, that dealing with the general 

 equations of dynamics. The problem of small oscillations forms 

 the subject of a special chapter, and the book concludes with a 

 useful discussion of the principles of Thermodynamics. 



Ausfjewdhlte Methoden der Analytischen Chemie. Von Prof. Dr. A. 



Classen. Erster Band. Unter Mitwirkung von H. Cloeeex. 



Mit 78 Abbildungen und einer Spectraltafel. Braunschweig : 



F. Vieweg und Sohn. 1901. Pp. xx-f 940. 

 This important work, which is largely the outcome of the author's 

 varied experience, is intended as a guide for the professional 

 chemist, and the student who has already mastered the general 

 methods of chemical analysis. Special attention has been given 

 to the methods for detecting and accurately estimating the 

 amounts of a number of elements generally referred to as the 

 " rare " elements, many of which have of late years acquired 

 technical as well as purely scientific interest. In his preface, the 

 author states that the methods described by him have either been 

 frequently used by himself, or else critically examined and tested by 

 others : it is therefore no mere indiscriminate collection of methods 

 suitable and unsuitable that we have to deal with in this book, 

 but, as its title implies, a careful selection of the more important 

 and practically useful methods. 



The arrangement of the subject-matter follows one uniform 

 plan, and renders it very easy to find any required information. 

 The metallic elements, which alone are considered in this volume, 

 are arranged in their usual analytical order, silver heading the 

 list. The qualitative tests by means of which the presence of the 

 particular element considered may be ascertained first receive 

 attention. Then come the various gravimetric, electrolytic, and 

 volumetric methods of quantitative analysis applicable to the 

 particular element in question. ]Sext follow methods for 

 separating the element under consideration from those preceding 

 it, and the final section deals with the analysis of such compounds 

 of the metal as are of commercial importance, At the end of the 

 book is given a most useful set of tables for facilitating the 

 numerical calculation of the results of an analysis. 



Copious references to original sources of information are given; 

 and the very complete index greatly adds to the value of the book 



