352 Dr. Parkes on the Elimination of Nitrogen. [Jan. 31, 



There was scarcely any difference in T., and only 10 per cent, difference 

 in S. 



The Nitrogen. 





s. 



T. 



After rest- 

 period. 



After work- 

 period. 



After rest- 

 period. 



After work- 

 period. 



Urea. 



Total 

 nitro- 

 gen by 

 soda- 

 lime. 



Urea. 



nitro- 

 gen by 

 soda- 

 lime. 



Urea. 



Total 

 nitro- 

 gen by 

 soda- 

 lime. 



Urea. 



XOLo/i 



nitro- 

 gen by 

 soda- 

 lime. 





20-67 

 25-68 

 £6-29 

 29-67 



9-703 



12- 304 



13- 704 



14- 260 



20-8 

 26-364 

 28-32 

 30-10 



10-237 



13- 065 



14- 590 



15- 555 



14-40 

 23-00 

 25-20 

 22-99 



7-441 



11- 480 



12- 209 



13- 231 



23- 00 



24- 36 

 24-57 

 21-36 



11-58 

 13-00 



10-395 





25-555 



12-988 



26-396 



13-361 



21-397 



11-095 



23-322 



11-658 



Mean 

 of 3 

 days. 



Unfortunately, on the third day, in the case of T., the determination of 

 the nitrogen by soda-lime was not satisfactory, and as some time elapsed 

 before it could be again done, the amount has been omitted. But sup- 

 posing there was the same relative excess over the ureal nitrogen as in the 

 other days, the total nitrogen would have been 13*97 grms. Adopting 

 this number, the following are the results : — 





s. 



T. 





3-364 

 1-492 



7-700 

 4-560 



The question now arises, was this excess of nitrogen excreted during 

 the after work-period the result of the elimination of the products of 

 destroyed muscle during the work-period, or was it the consequence of an 

 excess of nitrogenous food in the four days following the exercise ? 



S. took 1*31 oz. avoirdupois more meat cooked and | oz. veg;etables in 

 the fifth than in the third period. The percentage of water in the meat 

 was 57'49, and if the nitrogen be taken at 2*955 per cent., there would 

 be in l'3l oz. of cooked meat 1*1 grm. of nitrogen. In the vegetable 

 there would be about 0*04 grm. of nitrogen. But from this amount must 

 be deducted '325 grm. of nitrogen not taken in the bread, making the 

 total daily excess of nitrogen taken in the fifth period '815 grm.; the 

 daily excess of nitrogen in the urine was, however, only '375 grm. ; there- 

 fore, in the case of S., it cannot be affirmed that any excess of nitrogen 

 was derived from disintegration of muscle during the exercise. In the 

 case of T., the daily excess of nitrogen was larger, amounting daily to 



