LIST OF FIGURES IN PART I. 



FIG. PAGE 



1. A muscle-nerve preparation .... ... 59 



2. Diagram of du Bois-Reymond key . . 61 



3. Diagram illustrating apparatus arranged for experiments with muscle 



and nerve 63 



4. Diagram of an Induction Coil 65 



5. The Magnetic Interrupter 66 



6. The Magnetic Interrupter with Helmholtz's arrangement for equalizing 



the make and break shocks ........ 67 



7. A muscle curve from the gastrocnernius of a frog 69 



8. The same, with the recording surface moving slowly .... 69 



9. The same, with the recording surface travelling very rapidly ... 70 



10. The Pendulum Myograph 71 



11. Diagram of an arrangement of a vibrating tuning fork with a Despretz 



signal 73 



12. Curves illustrating the measurement of the velocity of a nervous impulse 75 



13. Tracing of a double muscular contraction 79 



14. Muscle curve. Single induction shocks repeated slowly ... 79 



15. The same, repeated more rapidly 79 



16. The same, repeated still more rapidly ....... 80 



17. Tetanus produced with the ordinary magnetic interrupter ... 81 



18. Non-polarisable electrodes ......... 107 



19. Diagram illustrating the electric currents of nerve and muscle . . 108 



20. Diagram illustration of the progression of electric changes . . . 112 



21. Diagram of ascending and descending constant current .... 128 



22. Diagram of the electrotouic changes in irritability 130 



23. Diagram illustrating electrotonic currents 131 



24. Scheme of the nerves of a segment of spinal cord 170 



25. Apparatus for investigating blood-pressure . . . 205 



26. Tracing of arterial pressure in dog 206 



27. Tracing of arterial pi-essure in rabbit 207 



28. Ludwig's Kymograph . 208 



29. Diagram of fall of blood-pressure in arteries, capillaries and veins . . 209 



30. Arterial model 215 



31. Tracing from arterial model with little peripheral resistance . . . 216 

 31*. The same with increased peripheral resistance 217 



