APPENDIX II. 149 



whereas, when muscle is most completely consumed 

 in the body, the products are carbonic acid, water 

 and urea ; the whole of the nitrogen passes out of 

 the body as urea a substance which still retains a 

 considerable amount of potential energy. Dry 

 muscle and pure albumen yield, under these circum- 

 stances, almost exactly one-third of their weight of 

 urea, and this fact, together with the above determi- 

 nation of the actual energy developed on the com- 

 bustion of urea, enables us to deduce with certainty 

 the amount of actual energy developed by muscle 

 and albumen respectively when consumed in the 

 human body. It is as follows : 



Actual energy developed "by one gram, of each substance token 

 consumed in the body. 



2ndly. We have thus ascertained the first of our 

 three data, viz., the amount of force or actual energy 

 generated by the oxidation of a given amount of muscle 

 in the body ; and we now proceed to ascertain the 

 second, viz., the amount of mechanical force exerted 

 by the muscles of the body during a given time. 

 For this purpose we have only to avail ourselves of 

 the details of Tick and Wislicenus's conclusive 

 experiment already referred to, and which consisted 

 in the ascent of the Faulhorn in Switzerland from 



