viii CONTENTS 



LECTURE V 



PAGE 



The Discharge of an Electrical Organ in Response to Direct Excita- 

 tion Du Bois-Reymond's Summary Similarity between " Blaze- 

 currents" of the Skin and " Discharges" of an Electrical Organ- 

 Normal Direction of the Organ-current A Speculation and some 

 Experiments Further Investigation of these Currents by the 

 ABC Method The Positive Polarisation of du Bois-Reymond 

 -The Polar After-currents of Hering and of Biedermann- 

 Ritter's Tetanus and the Post-anodic Action Current . . 76 



LECTURE VI 



A Representative Experiment Effects of Indirect Excitation- 

 Effects of Direct Excitation immediately after Death, and 

 Later How Long, after a Cat's Death, can a Cat's Foot con- 

 tinue to Exhibit Signs of Life ? More A B C A Vegetable 

 Surface Surface against Surface Anodic and Kathodic 

 Biedermann and the Frog's Tongue A Warning . . 97 



LECTURE VII 



Observations on the Human Skin Du Bois-Reymond's Experi- 

 ments Tarchanoff's Observations Sweat-prints Introduction 

 of Ions through the Skin . . . . . . 114 



LECTURE VIII 



The Fallacy of the Electrodes Water Transport at Anode or Kathode 



Alteration of Resistance at Anode or Kathode . . .129 



APPENDIX 



The Normal Circuit Galvanometer, Coil, Compensator, Electrodes, 

 and Keyboard Photographic Recording Lippmann's Capillary 

 Electrometer Special Keys Units of Resistance and of Con- 

 ductance . . . . . '5 1 



INDEX . ..... 173 



