KATHODIC POLAKISATION OP MUSCLE. 



357 



exceptions, at least at the season (early spring) when my experi- 

 ments were performed. Later in the year, when the animals have 

 been for a longer period in a higher external temperature, and their 

 muscles no longer show that beautiful red tint which is so 

 characteristic of their good condition, even slight traces of positive 

 kathodic polarisation are only exceptionally observed. 



Now it is very remarkable and of the greatest interest for the 

 interpretation of positive kathodic after-currents, that after killing 

 the end of the muscle corresponding to the 'physiological kathode,' it is 

 easy, even in less sensitive preparations, to observe tolerably strong 

 positive after-currents when atterminally directed battery-currents are 

 used for stimulation. 



A glance at the above Tables 4, 5, and 6 shows, that after the 

 kathodic end of the muscle has been killed, positive polarisation 

 at the points of exit of the current is just as possible here as 

 in the veratrine muscle. In the majority of cases indeed a con- 

 siderable strengthening of the + deflections took place after the 

 injury. This justified the expectation, that in cases also where 

 positive kathodic effects are not demonstrable at all, they might be 

 produced, so to speak, artificially, by killing the kathodic end of the 

 muscle. The following series of experiments show that this is in 

 fact the case. 



7. Sartorius of R. temporaria, curarised. 

 ment as before. MC = 20 sc. 



Arrangement of experi- 



