\^\ ^^^^^^ /^/ 

 ILLUSTRATIONS. '^^^^^*^^>''^ 



LECTURE I. 



PAGF, 



Fig. I. — A lump of protoplasm as a voltaic couple - - - 2 



„ 2. — A simple voltaic couple ------- 4 



„ 3. — Zinc is electro-positive ------- 5 



„ 4. — Muscle currents -------- 8 



„ 5. — Nerv^e currents -------- 10 



„ 6. — Simultaneous record of the mechanical and electrical 



responses of muscle - - - - - - - 13 



„ 7.— Simultaneous record of the electrical response of nerve 



and of the mechanical response of muscle - - - 18 



„ 8. — Effect of ether on nerve ------- 23 



,, 9. — Effect of chloroform on nerve ------ 23 



LECTURE IL 



,, 10. — Plan of apparatus -------- 33 



„ II. — An application of Ohm's law. Compensation. - - ^<^ 



„ 12. — Dead-beat and ordinary galvanometers - - - - 39 



„ 13. — Effect of soda water on nerve - ----- 43 



„ 14. — Effect of alcohol on nerve ------ 43 



„ 15. — Effect of tobacco smoke on nerve ----- 43 



„ 16. — Excitant effect of carbon dioxide ----- 47 



„ 17. — Anaesthetic effect of carbon dioxide - - - - 47 



„ 18.— Excitant effect of expired air ------ 52 



LECTURE IIL 



„ 19. — Effect of COo on carbonised nerve ----- 56 



„ 20. — Hypothesis --------- 58 



„ 21. — Verification --------- -q 



,, 22. — A typical " dead-beat "' series ------ 60 



„ 23. — Three stages - - - - 61 



„ 24 to 31. — Influence of carbon dioxide and of tetanisation upon 



nerve in first, second and third stages - - 64-5 



„ 32. — The staircase effect of the heart ----- 68 



„ 32<:?. — The staircase effect in nerve ------ 68 



„ 33. — Effect of tetanisation on " unfed ' nerve - - - - 74 



„ 34. — Effect of tetanisation on '' fed '' nerve - - - - 74 



