XU CONTENTS. 



PAGE 



ciple of the dispersion of forces; 5. Independent irrita- 

 bility of muscle-substance; 6. Curare; 7. Chemical irri- 

 tants ; 8. Theory of the activity of the nerves . , . 244 



CHAPTER XVI. 



]. Various kinds of nerves ; 2. Absence of indicable differences 

 in the fibres ; 3. Characters of nerve-cells ; 4. Various kinds 

 of nerve-cells; 5. Voluntary and automatic motion ; 6. Re- 

 flex motion and co-relative sensation ; 7. Sensation and 

 consciousness ; 8, Retardation ; 9. Specific energies of 

 nerve-cells; 10. Conclusion 261 



NOTES AND ADDITIONS. 



1. Graphical Representation. Mathematical Function . . 293 



2. Irritation of Muscle- Fibres, Height of Elevation and Per- 



formance of Work . 297 



3. Excitability and Strength of Irritant. Combination of 



Irritants 299 



4. Curve of Excitability. Resistance to Transmission . . 800 

 6. Influence of the Length of Irritated Portion of Nerve . 303 



6. Difference between closing and opening Inductive Cur- 



rents. Helmholtz's Arrangement 304 



7. Effect of Currents of Short Duration 307 



8. Unipolar Irritation 309 



9. Tangent Galvanometer 310 



10. Tensions in Conductors ....... 311 



11. Duplex Transmission. Degeneration, Regeneration, and 



Healing of P>isected Nerves 312 



12. Negative Variation and Excitement 313 



13. Electrotonus. Secondary Pulsations effected by Nerves. 



Paradoxical Pulsation 314 



14. Parelcctronomy 315 



15. Discharge Hypothesis and Isolated Transmission inNerve- 



Fibro 31G 



