SCIENCE— ADVERTISEMENTS 



QualStative Chemical Analysis 



EIGHTH EDITION 



By Arthur A. Noyes, 

 Director of Chemical Research in the California Institute of Technology. 



The Eighth Edition of Professor Noyes's widely known text-book in QuaHtative 

 Analysis is a complete revision ; it is the result of many years of research and presents 

 the most authoritative present-day methods. The successive editions have approached 

 as their goal a system of analysis consisting of the simplest possible methods which 

 will provide for the reliable detection of a small quantity (i mg.) of any constituent 

 in the presence of a large quantity (500 mg.) of any other constituent. In the new 

 edition both the experimental and theoretical aspects of the subject have been treated 

 anew ; the entire book has been rewritten, although the general plan and arrangement 

 of the previous edition is retained. Cloth, 8vo, 182 pages, $2.25. 



A Text- book of Physics revised edition 



By Louis B. Spinney, 



Professor of Physics at Iowa State College. 



In revising this book the author has aimed primarily to increase its teachability 

 and to make the discussions clearer. The section on electricity has been improved by 

 a rearrangement of the chapters in order to gain a more direct approach to the gen- 

 eral subject and to afford a more logical basis for definitions of the fundamental units. 

 The most recent investigations concerning X-rays have been recorded. The consideration 

 of Newton's laws has been amplified. Other important changes are: the use of both the 

 ray and the wave front in diagrams for reflection of light; a fuller treatment of lenses and 

 diffraction gratings ; and introduction of the vacuum tube with its applications in radio- 

 telegraphy and radiotelephony. Cloth, Svo, 617 pages, $4.00. 



In Preparation 



Elementary Calculus 



By William F. Osgood, Ph.D., LL.D., 



Professor of Mathematics in Harvard University. 



To be published early in December. 



This new Calculus is intended for students who are beginning the subject and is par- 

 ticularly well suited for use in Freshman courses in colleges and technical schools. A brief 

 chapter on differentiation is followed by sections on the applications to msixima and minima, 

 velocities and rates, and curve tracing, and on numerical computation, including the method 

 of trial and error, of successive approximations. The illustrative exercises discussed in 

 the text have been chosen with the utmost care. The problems are numerous and carefully 

 graded, so that instructors may readily select those which conform to the intensiveness of 

 their courses. 



Plane and Solid Analytic Geometry 



By William F. Osgood, Ph.D., LL.D., Professor of Mathematics and William 



C. Graustein, PhD., Assistant Professor of Mathematics, 



in Harvard University. 



To be published in January. 



A substantial introductory course in analytic Geometry, setting forth the principles and 



methods as applied to the study of right lines and conies in the plane, and linear and 



quadratic configurations in space. Each chapter commences with a thorough elementary 



treatment which will afford the student a firm grounding in all the topics. 



THE MACMILLAN COMPANY ^^^^ 



