1871.] Effect of Diet tyc. on Elimination of Nitrogen. 35$ - 



The results show no diminution in the urea during the two hours of 

 exercise ; the slight increase may perhaps be disregarded. In the two 

 hours of rest, there is equally inconsiderable increase after exercise ; the 

 excess in the 4 hours of the second section of 10 days was 1*58 gramme. 

 In the next 20 hours there was an increase of "828 gramme, equal to *3864 

 gramme, or 6 grains of nitrogen. The differences are so small as probably 

 to fall within the limit of error, and it is impossible to affirm that exercise 

 to the amount of 100-foot tons in two hours made any alteration in the 

 urea. 



Mean amount of nitrogen as determined by soda-lime. 





6 to 8. 



8 to 10. 



10 to 6. 



Total. 



ist section of io days*: \ 



i -489 



1-492 



16-902 



19-883 



2nd section of jo days: 1 

 exercise from 6 to 8 a.m., V 

 rest from 8 to io a.m. ... J 



I-438 



1-399 



16-924 



19761 



The nitrogen by soda-lime showed very slight variations. There was a 

 slight decrease in the 2 hours' exercise and in the 2 hours' rest after exer- 

 cise over the corresponding period ; but it is so trifling that I hesitate to 

 draw any conclusions. The figures show that the slight increase in the 

 urea was, as supposed, an unavoidable error. Looking to the figures of the 

 nitrogen by soda-lime as more correct, it seems that 2 hours' additional 

 exercise produced no marked change in the outflow when the inflow of 

 nitrogen was constant. This result, as far as it goes, certainly bears out 

 Voit's assertion of the constancy of the nitrogen, but it does not destroy 

 the conclusions formerly drawn that the nitrogen lessens during exercise 

 and increases afterwards, because the amount of exercise was in the present 

 case very much less ; and as the alteration in the nitrogen even in the former 

 experiments, with much more severe exercise, fell within narrow limits, it 

 might easily have been anticipated that work of only one-sixth the amount 

 would be inappreciable. The method of experimenting also does not 

 appear to me to be so good as that formerly used. 



Amount of nitrogen, in grammes, in the stools. 





Percentage composition. 



Amount in 24 hours. 



Solids. 



Water. 



Nitrogen. 



Solids. 



Water. 



Nitrogen. 



8th day of ist period.. 

 7th day of 2nd period. 



21-592 

 25-00 



78-048 

 75-00 



ri66 

 i'379 



42*929 

 26-115 



152-691 

 78-345 



2-279 

 1-441 



* The nitrogen in the 2 first days is not included in the mean of the hours 6 to 10, 

 as the urine was lost on one occasion, and on the other the experiment was uncertain. 

 The mean of these hours (6 to 10) is therefore for 8 days. 



