344 



THE KOTHAMSTED EXPERIMENTS. 



Power. He subsequently himself made numerous calori- 

 metrical determinations of the energy evolved by the combus- 

 tion of muscle, urea, and various foods, or constituents of 

 foods, the results of which were published in a paper — On the 

 Origin of Muscular Power. 1 Stated in a few words, his main 

 conclusion was, that the transformation of muscular tissue 

 alone cannot account for more than a small fraction of the 

 muscular power developed by animals. 



TABLE 79. 



Total 

 nitrogen. 



Nitrogen 

 excreted 

 per hour 

 (average). 



FICK. 



WISLICENUS. 



Keiiner's Dr Oskar Kellner, who was one of Professor Emil von 

 expert- Wolff's associates in numerous investigations with animals at 



7)1671 tS 



Hohenheim, made experiments there with a horse 2 from June 

 15 to August 10, 1878. The daily food of the animal con- 

 sisted of 5 kilog. meadow-hay, 6 kilog. oats, and 1.5 kilog. 

 wheat-straw-chaff. The horse was made to go different dis- 

 tances, and to draw different weights, the draught being mea- 

 sured by a horse-dynamometer. 



Table 80 gives a summary of some of the conditions and 

 results of the experiments. 

 increased In reference to these results, which certainly do show an 

 excretion of increased excretion of nitrogen with increased work duriug the 

 second, third, and fourth periods, as compared with the first 

 and fifth, Kellner considers that they are inconsistent with 

 the conclusions of Pettenkofer and Voit, and others, which 

 connect muscular action more exclusively with the oxidation 

 of non-nitrogenous matters, and that those views require to 

 be modified. At the same time, admitting that the transfor- 



1 Phil. Mag., 1866, 4th Series, vol. 32, pp. 182-199. 



2 Landwirthschaftliche Jahrbiicher, vol. viii., part v., 1879, pp. 701-712. 



nitrogen 

 with in 

 creased 

 work. 



