1910.] Reversal of the Reflex Kffect of an Afferent Nerve. “441 
te te. i oe h A eA I A AL 
OSA AAR RA 
eis eae: 
aU ae 
Fic. 5.—Isolated Vasto-crureus iMuscle ; decerebrate preparation. Tonus-like reflexes. Ascent of the ,myogram 
_ line signifies contraction. Time in seconds above ; signal below. Throughout the period in which the signal 
line is heightened a series of brief galvanic currents alternating in direction and alternately waxing and 
waning in current strength was delivered at the rate of about 22 per second wd non-polarisable electrodes to 
the central stump of severed ipsilateral popliteal nerve. The scale of magnification by the myograph lever is 
the same as in the other tracings. 
AE EAT NEE NEE 8 eS Nea Np ee SSNS ONIN AOA hr 
Fie. 6.—Isolated Tensor Fasciz Femoris Muscle ; decapitate preparation. Time above 
in seconds; signal below. During the downward gaps in the signal line the 
popliteal nerve, central end, was stimulated by faradism, and in the successive 
records the strength of the stimulation was successively increased. The reflexes 
form a series of reflex contractions of successively increasing intensity. With the 
weakest stimulus, the intensity of the contraction declines during the 6 seconds’ 
continuance of the stimulus; with the next stronger stimulus, the intensity of 
contraction is maintained during the 6 seconds’ continuance of the stimulus ; with 
the still stronger stimuli, the intensity of contraction increases during the stimulus ; 
and with the strongest stimulus, the contraction persists in some measure as after 
discharge for several seconds subsequent to cessation of the stimulus itself. 
