50 
these records the instrumental magnification is about the same, viz. 
about 3 
times. The tracings show strong contractions, just as we 
feel them to be. 
We see from the curves that the contractions of 
Fig. 4. 
the calf-muscles alternate indeed with those of the tibialis anticus: 
the contractions of one group relax during the contractions of the 
other group. 
The curves of the contraetion of the anterior muscles as well as 
those of the gastrocnemius show a few peculiarities. The curve of 
