204 Prof. C. S. Sherrington and Miss S. C. M. Sowton. [June 29, 



increase of the stimulus, inhibition without any apparent contraction at all 

 results. As the strength of stimulus is increased further still, the only 



Fig. 2. — Reversal of reflex effect on increasing the intensity of the intercurrent stimulus, 

 its result changing from contraction to inhibition. Semitendinosus (cat, decerebrate). 

 Lower signal marks stimulation (f aradic) of ipsilateral afferent (peroneal + popliteal) 

 giving reflex contraction of the muscle. This stimulus remains of the same intensity, 

 namely, 100 units, Kronecker inductorium, in all three of the successive observa- 

 tions. Upper signal marks stimulation (faradic) of the contralateral afferent 

 (peroneal + popliteal) ; this intercurrent stimulus is quite weak (secondary coil at 

 22 cm.) in a and c, but in b is strong (secondary coil at 3 cm.). Time, in seconds, 

 above. 



further change in the reflex effect is that the pure inhibition becomes more 

 prompt and more profound. 



