ON THE THEORY OF GALVANOTROPISM 



443 



This reduplication of the secreting regions after the 

 sectioning of the spinal cord is noticed not only immediately 

 after severance of the cord, but at any time, even eight 

 weeks after the operation--! have not as yet studied these 

 animals for a longer time than this after the wound has 



FIG. 128 



healed so perfectly that it is impossible to recognize the 

 position of the incision. These experiments render it very 

 probable that the polar secretion of the glands of the skin, 

 when a current is passed longitudinally through the animal, 

 is determined by a stimulation of the central nervous system. 



FIG. 129 



It also seems as though the entire central nervous system 

 behaves like a homogeneous whole, and as though the stimu- 

 lation with a constant current occurs at the anode. 



3. In order further to test this possibility, I cut a number 

 of Amblystoniae into small pieces. It was, of course, impos- 

 sible to keep these pieces alive, so they had to be experi- 

 mented upon immediately. In this way it was found that 

 every piece of the animal which still possesses its correspond- 



