BY THE SAME AUTHOR 



THE ELECTRON THEORY 



A POPULAR INTRODUCTION TO THE 



NEW THEORY OF ELECTRICITY 



AND MAGNETISM 



With a Preface by 

 G. JOHNS-TONE STONKY, M.A., D.Sc., F.R.S. 



With Frontispiece Portrait of Dr. Stoney, 

 and 35 Diagrams in the Text 



Crown 8vo, 5. net 



LONGMANS, GREEN, AND CO. 



LONDON, NEW YORK, BOMBAY, AND CALCUTTA 



