1910.] Reversal of the Reflex Effect of an Afferent Nerve. 448 
elicited the tonus reflex of contraction was stimulated through the same 
electrodes as before with weak faradic currents (60 Kronecker Berne units) 
for one second. The result of this latter stimulation is seen to be immediate 
reflex inhibition. By these two different stimuli two diametrically opposite 
reflex effects are therefore elicitable from the same muscle by the same 
UUUUTUUUNUUUUUCUUUNUNNeNuvUvUrruUUuucnucuuvuvucervcrvcvlurre 
Fic. 7.—Isolated Vasto-crureus Muscle; decerebrate preparation. Ascent of the 
myogram line indicates shortening of the muscle; descent indicates lengthening. 
Time above in seconds ; signal below, moves upward to indicate stimulation. Two 
periods of stimulation are shown by the signal: an earlier more prolonged period, 
and a later shorter one. During the earlier the popliteal nerve (central stump) was 
stimulated by weak galvanic currents provided by the rotating rheonome, and in 
consequence of this stimulation the tonus of the muscle rose. After this stimulation 
the afferent nerve was, through the same electrodes, stimulated by weak faradisation 
for 1 second ; inhibitory relaxation immediately resulted. 
electrodes acting on the same afferent nerve, and at a few seconds’ interval 
between the two reactions. 
A comparable result to that just mentioned is obtainable from the afferent 
nerve, ¢g., n. popliteus, by placing two pairs of electrodes upon it, and 
stimulating by faradism with one pair, by weak galvanic currents from the 
rheonome with the other pair. It makes no difference which of the electrodes 
