XU CONTEXTS. 



PAliB 



ciple uf tin' dispersion of forces; ~>. Independent irrita- 

 bility of muscle-substance; <">. Curare; 7. Chemical irri- 

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



CHAPTER XVI. 



1. Various kinds of nerves ; L'. Absence of indicable differences 

 in the fibres ; ;?. Characters of nerve-cells ; 4. Various kincl> 

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

 tlex motion and c .i-ivlative sensation; 7. Sensation and 

 consciousness; 8. Itetardation ; *). Specific energies of 

 nerve-cells; 10. Conclusion 2G1 



NOTES AND ADDITIONS. 



1. (iraphical \'<-\ >rescntat ion. ^latheniat ie.al inunction . . '_".':' 



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



formance of Work ........ L",i7 



;;. Ivxcitaliility and Strength of Irritant. Combination of 



Irritants .......... ^'.' c ,t 



4. Curve of Excitability. Resistance to Transmission . . :ton 



~>. Influence of the Length of Irritated Portion of Nerve . 303 



6. Difference between closing and opening Inductive Cur- 



rents. Helmholtz's Arrangement ..... :!<>t 



7. Effect of Currents of Short Duration . . ... ::n7 



8. Unipolar Irritation ........ 3()! 



;i. Tan _'< nt Galvanometer ........ I'.lo 



in. Tensions in Conduotora ....... :;ii 



11. l)ii]ile.\ Transmission. Degeneration, Hogcneralion, and 



Hcalitigof llisocted Nerves ...... :il'J 



12. Negative Variation and Excitement ... . ."KJ 

 ]:;. |-;ic, -trot onus. S'( ..... dary J'ulsatioiis dlViM i-<l by Neivea, 



Paradoxical I'uNatioii ....... .'ill 



II. rarclcctronomy . . ....... I!!.". 



]',. I li^charLTe llypol ln'.-i.> and Isolated Traii-inis>ion inNcr\c- 



|MH;X 



