CONTENTS. ix 



Part III. Experimental Section. 



CHAP. LESSON PAGE 



XXVII. 1. Electrical considerations. Galvanic cell. Amalga- 

 mation. Daniell. Leclanche cell. Leads. Keys. 

 Commutator. Hand electrodes ... ... ... 183 



2. Inductorium. Extra current ... ... ... ... 188 



XXVIII. 3. Dissection of the frog. Pithing. Dissection ... 195 

 XXIX. Experiments. Galvani. Rheoscopic limb 198 



4. Transmission of nervous impulses. Excitation of 



muscle and nerves ... ... ... ... ... 199 



5. Changes in the excitability of a nerve. Unipolar 



stimulation ... ... ... ... ... ... 202 



XXX. 6. Arrangements for recording ... ... ... ... 204 



XXXI. 7. Extensibility and elasticity of muscle 212 



8. Single muscular contraction and latent period ... 213 



9. Tetanus 216 



1O. Fatigue , 217 



11. Influence of load on work 218 



12. Heating and cooling muscle ... ... ... ... 221 



13. Curara experiment 223 



14. Effect of Veratria 224 



XXXII. 15. Experiments on nerves ... ... ... ... ... 226 



16. Rate of transmission of a nervous impulse... ... 228 



17. Electrotonus 231 



18. Pfliiger's law 233 



XXXIII. 19. Demarcation and action currents ... ... ... 236 



XXXIV. 2O. Circulatory system 240 



