250 



Mr. J. S. R. Russell. On the Nerve Roots of 

 Fia.4. 



action, and I showed that this is due to the fact that certain muscles 

 pass over more than one joint, and that they are not sufficiently long 

 to allow of full movement taking place at one of those joints without 

 their mechanically and passively pulling on their attachment on the 

 other side of the other joint or joints. In the fore-limb this difficulty 

 was chiefly encountered in connexion with the triceps, as when 

 traction was made on this muscle, in addition to extension at the 

 elbow joint, there resulted extension of all the lower segments of the 



