230 IMIYSIOLCM1Y <>F MfSCLES AND NKRYI -. 



facts, for but a few of which we have been able to find 

 place in tin- foregoing chapters, lie was dissatisfied with 

 tliis wav, and, therefore, tried the second. And thus he 

 was enabled t > form an hypothesis which afforded an 

 explanation of all the previously-known facts, 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- 

 finned 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-Keymond as being 

 alone capable of including and combining all electro- 

 physiological facts. 



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6 



Fi<;. 01. TMI:OKY <>K MAC.M.TISM. 



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 magm-lic rod. 

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

 po]e<, 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 cent re, each 

 half becomes a complete magnet, uith a north and a 



