14 Mr. Edward Arnold's List of New Books 



AN INTRODUCTION TO 



THE THEORY OF OPTICS. 



By ARTHUR SCHUSTER, Ph.D., Sc.D., F.R.S., 



PROFESSOR OF PHYSICS AT THE UNIVERSITY OF MANCHESTER. 



Demy 8vo. With numerous Diagrams. 155. net. 



This volume is intended to serve as an introduction to the study 

 of the higher branches of the Theory of Light. In the first part of 

 the book those portions of the subject are treated which are inde- 

 pendent of any particular form of the undulatory theory. The author 

 has endeavoured, by means of elementary mathematical reasoning, 

 to give an accurate account of the study of vibrations, and has laid 

 special stress on the theory of optical instruments. In the second 

 part mathematical analysis is more freely used. The study of 

 luminous vibrations is introduced through the treatment of waves 

 propagated in elastic media, and only after the student has become 

 familiar with the older forms of the elastic solid theory are the 

 equations of the electro-magnetic theory adopted. The advantage 

 of these equations, more especially in the treatment of double 

 refraction, is explained, and the theory of ionic charges is adopted in 

 the discussion of dispersion and metallic reflexion. 



THE ELECTRIC FURNACE. 



By HENRI MOISSAN, 



PROFESSOR OF CHEMISTRY AT THE SORBONNE; MEMBRE DE L'INSTITUT. 



Authorized English Edition. 

 Translated by A. T. DE MOUILPIED, M.Sc., Ph.D., 



ASSISTANT LECTURER IN THE LIVERPOOL UNIVERSITY. 



Demy 8vo. With numerous Illustrations. IDS. 6d. net. 



This work embodies the original French Edition, together with 

 the new matter incorporated in the German Edition. Moreover, 

 Professor Moissan has written, specially for this edition, a chapter 

 dealing with the most recent work. The book, while dealing largely 

 with Professor Moissan's own researches, gives a general survey of 

 the experimental work accomplished by means of the electric furnace 

 up to the present time. The bearings of this work on technical pro- 

 cesses are frequently discussed. 



