44 
THOMPSON YATES LABORATORIES REPORT 
Descripiion of Figures i to 4 in the texi', pp. 36 and 37. 
Fig. I. — Reciprocal innervation at the elbows of the monkc)-, both reacting under one spinal 
reflex. Flexion of one elbow is seen to accompany extension at the other, and at both reciprocal innerva- 
tion of the antagonistic muscles is evident. 
Fig. 2. — Reciprocal innervation of the lateral muscles of the eyeballs under cortical excitation of 
the left hemisphere, producing consensual movement of the eyeballs to the right, the sixth nerve of the 
right side having been severed at its exit from the base of the brain. The right eyeball is shown to move 
to the right up to the median position ; the left to beyond that. 
Fig. 3. — Reciprocal innervation instanced by the extensors and flexors of the elbow-joint in the 
monkey, obtained as a reflex from the twig of the radial nerve, the animal being in the condition of 
'decerebrate rigidity.' The tonic contraction of the extensors relaxes as the reflex contraction of the 
flexors sets in. 
Fig. 4. — Similar to the above, but obtained from the flexors and extensors of the knee-joint, and 
with levers, writing not in harmonious sense as above, but in opposing sense, so that the relaxation of the 
lower rectus femoris muscle is written upwards. 
