FEEDING OF ANIMALS. 343 



nitrogenous substance by the exercise of force, but there was Confirming 

 a very greatly increased exhalation of carbonic acid. It is I ^ mm ' u 

 evident, therefore, that in the exercise of force, the exigency 

 of the system is specially characterised by an increased 

 demand in the food for, so to speak, respiratory material. 

 The results of Pettenkofer and Voit are indeed of great 

 importance ; but in Germany they are even looked upon as 

 being the first to establish the correct view on the subject. 



TABLE 78. 



Abundant further confirmation of the now generally 

 accepted view is available, and it will be of interest to give 

 some illustrations. 



In 1866 results were published 1 as to the amount of Results in 

 nitrogen excreted before, during, and after ascending the f" 5 maw 

 Faulhorn, by Professor Pick and Wislicenus, in August 1865. 

 The experimenters took an ordinary meal at mid-day on the 

 29th, but then only starch, fat, and sugar until after the 

 ascent, which commenced early the next morning. Table 79 

 is a summary of the results so far as they relate to the point 

 under consideration. 



The record of the actual quantities is sufficient to show 

 that much less nitrogen was excreted by both experimenters 

 during, and after, than before the ascent. But the calculated 

 amounts of nitrogen excreted per hour during each of the 

 periods, as given in the last column of the table, bring the 

 main results more clearly to view. It is seen that, on the 

 average, only about two-thirds as much nitrogen was excreted 

 per hour during and after the ascent, as prior to it, when 

 there would be more or less residue in the system from the 

 last albuminous meal. 



The above results of Pick and Wislicenus were brought Frankiand 

 forward by Professor Frankiand, in a lecture which he gave ^ the - 



O SOUTC& Ot 



at the Eoyal Institution in 1866 — On the Source of Muscular muscular 



power. 

 1 Phil. Mag., 1866, 4th Series, vol. 31, pp. 485-503. 



