ON THE MAMMALIAN NERVOUS SYSTEM. 



333 



ligatured, divided below the ligature, and its central end connected in the manner 

 indicated in Chapter III. with the galvanometer or electrometer electrodes. (See 

 fig. 7.) 



isr. 7. 



We found that excitation of the cortex in most cases produced no perceptible 

 effects when the capillary electrometer was in connection with the nerve, and when 

 occasionally effects were seen, their complete absence in other instances, and their 

 rapid disappearance on repetition, threw doubt on the observations. 



With the galvanometer, however, effects could always be seen, though these 

 were very small in amount as compared with those observed in the spinal cord. In a 

 few cases, however, in which the excitation applied to the cortex was very intense, so 



