E. Frankland on the Source of Muscular Power. 407 
Comparable Powerful or 
formalz, unburnt matter, 
Muscle, - = - Casha; Ca,Uas 
Creatin, - - oe, Hy aye, ohh 
Cred, 2 UR ae, €;' 
Thus it is evident that the amount of creatin exceptionally 
retained in the system could not greatly affect the result of the | 
experiment as regards the possible amount of actual energy de- 
rivable from the metamorphosed tissues during the ascent; 
firstly, on account of the small quantity of creatin so retained, 
and, secondly, because creatin still contains about one-third of 
the potential energy of the muscle from which it is derived. 
muscles of the legs contained at the end of the ascent eleven 
times as much creatin as was present in them before the ascent, 
In the above tabular statement of results provision has been 
made for this allowance by adding together, on the one hand, 
the amounts of nitrogen secreted during the ascent and six 
hours after it, and, on the-other, the weights of dry muscle cor- 
responding to these two amounts of nitrogen. 
Having thus far cleared the ground, let us now compare the 
amount of measured and ealculated work performed by each of 
the experimenters during the ascent of the Faulhorn, with the 
actual energy capable of being developed by the maximum 
amount of muscle that could have been consumed in their bod- 
ies, this amount being represented by the total quantity of nitro- 
gen excreted in each case during the ascent and for six hours 
afterwards. 
Fick. | ‘Wislicenus. | 
Grams, Grams. 
Weight of dry muscle consumed 37-17 STO" 
Actual ene capable of being produced by the ) | Meterkilograms., Meterkilograms, 
eidslsiphind of 87-17 and 87°00 grams of dry 68,690 68,376 
muscle in the body, 
Measured work performed in the ascent (external t 129,096 148,656 
)s : 
Calculated circulatory and respiratory work Bt 30,541 35,681 
formed during the : : 
| 159,687 184,287 
It is thus evident that the muscular power expended by these 
gentlemen in the ascent of the Faulhorn could not be exclusively 
i es, or of other 
erived from the oxydation, either of their inusel of of 
nitrogenous constituents of their bodies, since the maximum of 
