113 
by a glasstube through which the apparatus can be quickly filled 
with a liquid (Fig. 2). 
Fig. 1. Myograms of a suspended frog’s gastrocnemius (real size). 
Fig. 2. Apparatus used for the recording of the reproduced myograms 
in fig. 1 (l/, of the real size). 
From the preceding communication we may conclude that the 
dilatation occurs with so much force that it is able to overcome 
the friction of the writing-needle over the drum. 
I put the question to myself whether the muscle would be able 
to lengthen itself in opposition to the gravitation. This led me on 
to two new proofs: 
When we do not put the muscle into chloroform and benzene, 
8 
Proceedings Royal Acad. Amsterdam. Vol. XXIII. 
