Crown 8vo. Price 5s. net 

 With Portrait of Dr. Stoney, and 35 Diagrams in the Text. 



THE ELECTRON THEORY 



A POPULAR INTRODUCTION TO THE NEW THEORY 

 OF ELECTRICITY AND MAGNETISM 



BY E. E. FOURNIER D'ALBE, B.Sc. (LoND.), A.R.C.Sc. 



WITH A PREFACE BY 



G. JOHNSTONE STONEY, M.A., D.So., F.R.S. 



"It is called a work of popularisation. But let there be no mistake : the 

 author haa here done truly scientific work." Journal de Physique. 



" The best possible introduction to modern views of electricity." Medical 

 Electrology. 



"An easily-read rendering of an abstruse subject. 1 ' Electrical Magazine. 



" A lucid popular account of the main outlines of the electron theory as it 

 exists at the present day." Spectator. 



"Mr. Fournier meets a distinct want In supplying a little volume which 

 explains the electron theory of magnetism and electricity in a simple yet 

 scientific manner." Pall Mall Gazette. 



"Mr. Fournier d'Albe haa been more than successful in presenting his 

 simple and lucid account of the new theory of electricity and magnetism ; and 

 it is not too much to say that it is just the book that was wanted, and we 

 heartily recommend it to the notice of our readers." Electricity. 



"A remarkable book, and one which contains a world of suggestion for all 

 who are concerned with electrical affairs, is Mr. . . Fournier's new treatise 

 on the ' Electron Theory,' a popular introduction to the new theory of electricity 

 and magnetism." Page's Weekly. 



"Mr. Fournier has done electricians a great service in writing this book. 

 Its title is too small, as it is really a book on 'electricity and magnetism' 

 treated from the electron point of view. This is just what has been wanted 

 for some little time." Electrician. 



" Mr. Fournier d'Albe, who has been long and favourably known as a com- 

 piler of a weekly chroniquc on electrical matters, may be congratulated upon 

 being the first in the field with a complete statement in English of the 

 electronic theory." The Athenceum. 



"This work gives an easily understood and very able treatment of the whole 

 subject of the electron theory, which deserves to be sincerely recommended as 

 introductory literature." Physikali$cht Zeitxchrift. 



" A glance at the table of contents of this book is sufficient to show that it 

 fills an acute want at the present time. It attempts the consistent application 

 of the all-embracing electron theory in an elementary manner to the whole 

 range of electro-magnetic phenomena. In making this attempt the author is 

 to be congratulated both on the choice of his subject and the skill and originality 

 he has displayed in accomplishing it. ... Few possess the necessary qualifica- 

 tions for a task which covers such a wide range of subjects, and, so far as we 

 know, this is the first time it has been seriously attempted. The book is 

 therefore uniqut, and should prove of value to the student, the teacher, and 

 the investigator." Nature. 



LONGMANS, GREEN, AND CO. 



LONDON, NEW YORK, BOMBAY, AND CALCUTTA 



