574 Prof. C. 8. Sherrington. On Reciprocal [ Nov. 3, 
In 4, B the experiment opens (lower signal line) with stimulation of the 
excitatory afferent nerve (contralateral popliteal) the secondary coil standing 
at 500 units on the Kronecker scale. The myogram shows immediate con- 
traction of the vasto-crureus. One second later stimulation of the inhibitory 
aa EEL 
Fig. 4. 
afferent nerve (ipselateral peroneal, upper signal line) at 150 units of the 
Kronecker scale is commenced, the stimulation of the excitatory afferent 
nerve being continued as before. The result on the muscle is immediate 
decrease of the grade of contraction. The concurrent stimulation is continued 
for 14 seconds, and during that period the contraction of the muscle continues 
to decrease more and more slowly until at end of that time the degree o 
