1871.] Effect of Diet §c. on Elimination of Nitrogen. 357 



lowest point. The kind of exercise, too, viz. digging, which is often attended 

 with intervals of rest, was not a good choice. Moreover, on the 3rd and 4th 

 days he took some common salt, which might possibly have interfered, as 

 it is supposed that chloride of sodium augments the outflow of urea. 



The experiment was therefore repeated at the period when the body was 

 poor in nitrogen from the use of the concentrated food. 



Second Experiments on Non-nitrogenous Food {Arrowroot , 

 Oil of Butter, and Sugar). 



Previous daily entry of nitrogen= 10*838 grammes. 



In this series the man did his ordinary work, which was not severe, and 

 tolerably uniform, during the first 3 days. Then on the fourth day he 

 marched 32 miles on level ground, carrying the new valise equipment, the 

 service-kit, 40 rounds of ball ammunition, rifle, bayonet, and great coat. 

 In all the weight was 43| lb., his own weight being 145 \ lb. The work 

 done was therefore 712*8 tons lifted a foot, or, in other words, it was an ex- 

 tremely hard day's work. He did 26 miles quite easily, but then was 

 greatly fatigued and got very tender about the feet, and had pains in the 

 calves of the legs. The next day he was, however, quite well, and declared 

 that he did not feel in the least weakened from having been 5 days on 

 starch and butter. The march commenced at 8 a.m., and with intervals 

 of \\ hour for meals, lasted till 7.30, so that actual muscular work both of 

 arms and legs was going on for 10 hours. The daily ingress of chloride of 

 sodium was uniform during the 5 days. 



Elimination of urinary water, in cub. centims. 





8 A.M. 



to 



8 P.M. 



8 P.M. 



to 



8 A.M. 



Total. 





950 



920 



800 



585 



765 



570 



550 

 47O 



325 



495 



1520 

 1470 

 1270 

 910 

 1260 



Urea, in grammes. 





8 A.M. 



to 



8 P.M. 



8 P.M. 



to 



8 A.M. 



Total. 



2nd day, usual work 



4th day, marching 



4*563 

 9-562 



2-762 

 6'435 



13-072 

 10-731 

 9-271 

 7*323 

 I5-997 



