Bodily Labour upon the Discharge of Nitrogen. 471 



assumption I have set back the faeces, so that in Table C they appear 

 opposite the day to which they probably belong. In some cases this 

 has not been possible. On the whole I think this plan is better than 

 the alternative one of dividing them equally over the whole time, or 

 considering them quite separately. 



Table D shows the daily state of what I may call the debit and 

 credit account of the body as regards nitrogen. The fluctuations 

 of the " store nitrogen " can be comprehended very readily 

 from it. 



Table E gives the daily discharge of P 2 5 by urine and faeces, on 

 the same assumption as that made in constructing Table C. 



Table F shows the results of all observations on pulse, respiration, 

 temperature, and body-weight. 



Table G gives the mean daily value of the observations recorded in 

 Table F. 



Table H shows the amount of work done, and' the loss of weight 

 sustained in consequence. 



I had originally intended to enter upon the question of the force 

 value of the food and its relation to the energy expended during the 

 work. At the best it would only have been an estimate based on 

 Professor Frankland's* tables, and the data from which the work of 

 the body, both internal and external, are so inexact and untrustworthy, 

 that under the circumstances I have thought it best to content myself 

 with a simple statement of the number of miles walked, and the time 

 occupied in the performance of the work. It will be sufficient here 

 to say that the general truth of the conclusions drawn from the 

 classical experiment of Professors Fick and Wislicenus is confirmed by 

 the results of these experiments in every case. 



It is to be understood that except when otherwise stated, the diet 

 was that given in the table accompanying the section in which the 

 diet was discussed, and that no exercise was taken except such as was 

 involved by my ordinary occupation. 



Experiment I, 1882. May 24itJi to June 1st. 



The figures in Table A point conclusively to the fact that the work 

 done on May 28th caused a considerable increase in the nitrogen dis- 

 charged by the urine. The average daily discharge on the four days 

 before the work was 14*15 grams, whilst during the remaining five 

 days it rose to an average of 15*74 grams, and the increase not only 

 affected the discharge on the day of the work, but every succeeding 

 day. There was apparently no tendency to return to the average dis- 

 charge before the work, and it would seem as if the exertion had simply 

 served to give tone and regularity to the nitrogen discharge. 



* "The Origin of Muscular Power," "Phil. Mag.," No. 215, September, 1866. 



