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LIBERATION OF ENERGY BY MUSCLE
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isolated muscles of frogs, and to some extent were vitiated by the conditions in which the muscles were examined.
To illustrate what is meant by the work of a muscle, I show you here an interesting experi-
Fig. 63.—The work-gatherer of Fick. It may be called a muscle-winch or muscle-capstan.
ment carried out by an ingenious instrument devised by Professor Fick, and which he calls the Arbeitssammler, the work-gatherer. It is a little windlass or capstan, which you see is turned by a frog's muscle placed above it, and
