xvi CONTENTS 



CHAP. PAGE 



IX. HELMHOLTZ IN KONIGSBERG ANIMAL 



ELECTRICITY 104 



X. HELMHOLTZ IN KONIGSBERG STUDIES IN 



COLOUR 112 



XI. HELMHOLTZ IN BONN AND HEIDELBERG 



SENSATIONS OF TONE . . .129 



XII. HELMHOLTZ IN BONN AND HEIDELBERG 



SENSATIONS OF TONE CONTINUED. 145 



XIII. HELMHOLTZ IN HEIDELBERG MINOR 



PHYSIOLOGICAL RESEARCHES . .169 



XIV. HELMHOLTZ IN BERLIN PHYSICAL RE- 



SEARCHES 183 



XV. HELMHOLTZ IN BERLIN PHYSICAL RE- 

 SEARCHES CONTINUED . . .201 



XVI. HELMHOLTZ IN BERLIN PHYSICAL RE- 

 SEARCHES CONTINUED . . .233 



XVII. THE PHILOSOPHICAL POSITION OF HELM- 

 HOLTZ 250 



XVIII. HELMHOLTZ ON ESTHETICS . . . 268 

 XIX. HELMHOLTZ AS A LECTURER . . 273 



XX. HELMHOLTZ IN BERLIN CLOSING YEARS 



AND PERSONAL CHARACTERISTICS . 279 



POEM HERMANN VON HELMHOLTZ . 289 



BIBLIOGRAPHY 291 



INDEX ....... 295 



