52 
expect that the inverse action of the contracting calf-muscles on the 
form of the muscle twitches of the tibialis anticus will be rather 
considerable. The tibialis antiecus works against a tension which 
Fig. 6. 
varies over a much larger amount, which may even become negative. 
The latter never happens with the triceps muscle. Consequently we 
expect the tibialis curve to be much more deformed than the gastro- 
cnemius curve. On looking at our curves, we see that this is generally 
the case; but we also find that the influence of the two musclegroups 
on each other can easily be traced, though generally the action of 
