LIST OF FIGURES. 



no. 



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 



6. The magnetic interrupter 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. Ludwig'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's stromuhr . 173 



34. Chauveau and Lortet's haematachometer 174 



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



36. Tracing from heart of cat 186 



xliv 



