1888.] 



NATURAL SCIENCES OF PHILADELPHIA. 



161 



Nerve. 



Sciatic, length 2 cent, breadth 1 cent, thickness 0"5 mm. Resist- 

 ance of 47 ohms offered by pads etc. deducted from result. 

 Formuhi of experiments X : R : : A S : S B, X = Resistance 



1st Series 

 Longitudinally 

 Longitudinally 

 Longitudinally 



Mean 



Transversely 

 Transvei-sely 

 Transversely 



[in ohms, 

 X : 2000 : : 840 : 160, X = 10453 

 X : 4000 : : 735 : 265, X = 11047 

 X : 5000 ; : 690 : 310, X = 11082 



X : 2000 

 X : 4000 

 X : 5000 



880 : 120, X 

 785 : 215, X 

 745 : 255, X 



Mean 

 2nd Series of experiments. 

 Longitudinally X : 2000 



Longitudinally 

 Longitudinally 



Mean 

 Transversely 

 Transversely 

 Transversely 



X : 4000 

 X : 5000 



X : 2000 

 X : 4000 

 X : 5000 



845 : 155, X 

 725 : 275, X 

 680 : 320, X 



860 : 140, X 

 740 : 260, X 

 685 : 315, X 



10860 



14619 

 14557 

 14160 



14445 



10856 

 10498 

 10578 



10644 

 12251 

 11038 

 11156 



Mean 11481 



Ratio of mean longitudinal to transverse resistance as shown by 

 1st series of experiments 1 to 3. 



Ratio of longitudinal resistance to that of mercury taken as unity 

 12066000 to 1 of transverse resistance 32099000 to 1. 



It will be observed that the ratio of the longitudinal to the trans- 

 verse resistance in nerve as well as the ratio of both the longitudinal 

 and transverse resistance in nerve as compared with mercury taken 

 as unity differ from the same ratios obtaining in muscle. It must 

 be borne in mind, however, that this difference is due to some extent 

 at least to the amount of nerve tissue used, being less than that of 

 muscle. 



