272 Prof. C. 8. Sherrington. - [Apr. 17, 
Fig. 1a. 
. >a 
“O01” 
electromagnet 

of primary 
circuit 
; \ \ \ \ \ 
Myograph = \ \ 
. SZ 
|! wera oF ; ; 
Fies. 14 and 1s.—The “ flexion reflex” observed as reflex contraction (excitation) of the 
flexor muscle of the knee (fig. 1a) and as reflex relaxation (inhibition) of the 
extensor muscle of the knee (fig. 18). The afferent nerve stimulated is a twig of 
the internal saphenous below the knee. The stimulation is by a series of break 
induction currents, the number and frequency of which is shown by the electro- 
magnetic record of the breaks and makes of the constant current feeding the primary 
spiral of the inductorium through a rotating key. The distance of the secondary 
