408 E, Frankland on the Source of Muscular Power, 
power capable of being derived from this source even under 
very favorable assumptions is, in both cases, less than one-half 
of the work actually performed. But the deficiency becomes 
much greater if we take into consideration the fact, that the ac- 
p as mu 
energy developed within it, the remainder taking the form of 
heat. Taking then this highest estimate of the proportion of 
mechanical work capable of being got out of actual energy, it 
becomes necessary to multiply by two the above numbers repre- 
senting the ascertainable work performed, in order to express 
the actual energy involved in the production of that work. We 
then get the following comparison of the actual energy capable 
of being developed by the amount of muscle consumed, with 
the actual energy necessary for the performance of the work 
executed in the ascent of the Faulhorn, 
Fick. Wislicenus, 
Actual é ern oe ia Meterkilograms. | Meterkilograms. 
ctual energy capable of being produced by 
muscle metamorphosis, . , ,... 68,690 68,376 
Actual energy expended in work performed, ,.. 819,274 868,574 
Thus, taking the average of the two experiments, it is evident 
that scarcely one-fifth of the actual energy required for the work per- 
could be obtained from the amount of muscle consume 
so military prisoners 
\dduced by Playfair and made upon pedestrians, pile-drivers, 
men turning a winch, and other laborers. 
Treadwi 1 
: expert 
with steps — at distances of eight inches, and the prisoners 
to turn the wheel downwards by stepping upwards, 
‘ou pe designated below as A, B, C, and D, were em- 
ployed in these experiments, and each worked upon the wheel 
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