84 ON THE INTERNAL POLARISATION OF NERVES. 



16000, 18000, 20000. The mutual relations between these 

 strengths of current I determined by the deflection of the gal- 

 vanometer, when the principal current went to the nerve and a 

 branch of it was led off" to the galvanometer by means of a 

 Siemens' rheostat. In order to exclude, as far as possible, the 

 effect of polarisation of the nerve, I passed the current through 

 the nerve in both directions at each determination, and took the 

 mean of the deflections obtained. The results are recorded in the 

 following table : 



Rheochord units in 

 No. the derivation circuit. 



1 100 



2 200 



3 300 



4 400 



5 500 



6 600 



7 700 



8 800 



9 900 



10 1,000 



11 1,500 



12 2,000 



13 2,500 



14 3,000 



15 3,500 



16 4,000 



17 4,500 



18 5,ooo 



19 6,000 



20 7,000 



21 8,000 



22 9,000 



23 io,ooo 



24 12,000 



25 ... ... 14,000 



26 16,000 



27 18,000 



28 20,000 



These values, with the corresponding rheochord units, are used 

 in the records of experiment which follow. The following table 

 comprises the results of a series of experiments relating to the 

 subject : 



