158 APPENDIX II. 



exceptionally retained in the system could not 

 greatly affect the result of the experiment as regards 

 the possible amount of actual energy derivable from 

 the metamorphosed tissues during the ascent ; firstly, 

 on account of the small quantity of creatin so re- 

 tained, and, secondly, because creatin still contains 

 about one- third of the potential energy of the muscle 

 from which it is derived. But as this point cannot 

 be experimentally demonstrated, the speaker followed 

 the example of Fick and Wislicenus, and made a 

 very liberal allowance on this score. He allowed, 

 as they had done, that the whole of the nitrogen 

 secreted during the six hours after the ascent was 

 exceptionally retained in the system as urea during 

 the ascent. This is equivalent to an admission that 

 the 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 corresponding to these two amounts of 

 nitrogen. 



5thly. Having thus far cleared the ground, let us 

 now compare the amount of measured and calculated 

 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 bodies, this amount being represented by 

 the total quantity of nitrogen excreted in each 



