1906.] On Innervation of Antagonistic Muscles. 



497 



the present. There an inhibition lasting only a fraction of a second is 

 seen to induce a rebound of extensor contraction, which adds itself to a 

 reflex concurrently in progress. Attention was not drawn to this feature 

 in describing the tracing at the time, because I did not then appreciate it. 

 The figure is here reproduced as fig. 9. The rebound is slight but distinct. 



The successive induction, and its rebound contraction, are obtained after 

 severance of the hamstring nerve. They are therefore not referable, as 

 might, perhaps, be thought, to centripetal impulses generated in the 

 hamstring muscles when contracting reflexly in response to stimulation 

 of the afferent nerve of the extensor. The successive induction appears, 

 therefore, directly, not indirectly, related to the stimulation of the afferent 

 nerve of the extensor. 



