53 
one group on the other dominates. In fig. 6 we see that the tibialis 
curve shows two successive tops. The first and larger one is the 
twitch of the tibialis proper, the second is caused by passive tension 
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of the tibialis by the contracting triceps surae. In the triceps curve 
we see a slight elevation in the descending part of the curve caused 
by the triceps contraction. 
In fig. 7 the tibialis curve is nearly undeformed as compared 
with an isotonic tibialis twitch; but the lower curve has in this 
case two clearly defined elevations, the higher of the two being the 
contraction proper, the lower one being caused by the tibialis con- 
traction. How is the difference between the curves 6 and 7 to be 
explained? In both cases the apparatus had been correctly applied. 
