230 PHVSIOLOGY OF MUSCLES AND NERVES. 



fiicts, for but a few of winch we have been able to find 

 place in the foregoing chapters, he was dissatisfied with 

 this way, and, therefore, tried the second. And thus he 

 was enabled to form an hypothesis which afforded an 

 explanation of all the previously-hnow^n flicts, of all 

 those which have come to light since the hypothesis 

 was first formed, and even of some which were first 

 indicated by the hypothesis itself and were then con- 

 firmed by experiment. It is true that attempts on 

 the other side have since been again made to restore 

 credit to the older hypothesis, but the attempts have 

 been in vain. We shall, therefore, fully accept the 

 hypothesis constructed by du Bois-Reymond as being 

 alone capable of including and combining all electro- 

 physiological facts. 



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Fig. GJ. Theory of magnetism. 



The phenomenon, that when a muscle-prism is cut 

 into two halves, each part exhibits an arrangement of 

 the electric tensions exactly analogous to that which 

 before prevailed in the entire prism, recalls a corre- 

 sponding phenomenon observed in the magnetic rod. 

 It is a well-known fact that every magnetic rod has two 

 poles, a north pole and a south pole. The magnetic 

 tension is greatest at these two poles, and decreases 

 towards the centre ; and at the actual centre it = 0. 

 If the magnet is then cut through in the centre, each 

 half becomes a complete magnet, with a north and a 



