LIST OF FIGUBES. 



FIG. PAGE 



1. A muscle-nerve preparation . .56 



2. Diagram of du Bois-Reymond key 58 



3. Diagram illustrating apparatus arranged for experiments with muscle 



and nerve .. 60 



4. Diagram of an induction coil ......... 62 



5. The magnetic interruptor _ . . .63 



6. The magnetic interruptor with Helmholtz's arrangement for equaliz- 



ing the make and break shocks 64 



7. A muscle-curve from the gastrocnemius of a frog 66 



8. The same, with the recording surface moving slowly .... 66 



9. The same, with the recording surface travelling very rapidly . . 67 



10. The pendulum myograph 68 



11. Diagram of an arrangement of a vibrating tuning-fork with a Desprez 



signal 70 



12. Curves illustrating the measurement of the velocity of a nervous impulse 73 



13. Tracing of a double muscle-curve 76 



14. Muscle-curve. Single induction-shocks repeated slowly . . . 76 



15. The same, repeated more rapidly 77 



16. The same, repeated still more rapidly 77 



17. Tetanus produced with the ordinary magnetic interruptor ... 78 



18. Non-polarizable electrodes 98 



19. Diagram illustrating the electric currents of nerve and muscle . . 99 



20. Diagram illustrative of the progression of electric changes . . . 103 



21. Diagram of ascending and descending constant current . . . 112 



22. Diagram of the electrotonic changes in irritability .... 114 



23. Diagram illustrating electrotonic currents 115 



24. Scheme of the nerves of a segment of the spinal cord . . . 140 



25. Apparatus for investigating blood pressure 157 



26. Tracing of arterial pressure in dog . ... . -. . . .158 



27. Tracing of arterial pressure in rabbit . . . ... . 159 



28. Lud wig's kymograph ' . . 160 



29. Diagram of fall of blood pressure in arteries, capillaries and veins . 161 



30. Arterial scheme . 167 



31. Tracing from arterial model with little peripheral resistance .. . 168 



32. The same with increased peripheral resistance . . . . 169 



33. Ludwig'sstromuhr 173 



34. Chauveau and Lortet's hsematachometer . . ... . - . 174 



35. Diagram illustrating causes determining the velocity of the flow . . 176 



36. Tracing from heart of cat 186 



xliv 



