346 Dr. Parkes on the Elimination of Nitrogen. [Jan. 31^ 



tissues whicli had been brought into a state of nitrogenous inanition for 

 two days by cutting off the supply of nitrogen. 



Ax the end of the four days it was considered that the tissues had re- 

 covered their composition. 



Fourth Veriod, — Non-nitrogenous Diet and Exercise. 



Diet. — The diet during this period was of the same kind as in the second 

 period. The men were directed to eat what they pleased of arrowroot 

 made into cakes, and jelly, sugar, and the oil of butter. 



They took in the two days of December 17-18, and 18-19, the follow- 

 ing amounts : — 



Non-nitrogenous Food in two days, in grammes. 





S. 



T. 



Water-free arrowi'oot 



796-6 



586-8 





421-5 



360-0 





1218-1 



946-8 





188-5 



127-5 



Total water-free food 



1306-6 



1074-3 



Proportion of fat to starches 



1 to 6-46 



1 to 7-42 



The daily proportion of carbon was — 





S. 



T. 





270-400 

 74-478 



210-189 

 50-395 







Total 



344-878 



260-584 





The amount of water drank in the two days was. . 5159*5 4762*6. 



Both men eat more during this period, partly because they felt more 

 hungry, partly because the arrowroot-cakes were better made. T. espe- 

 cially took more butter, to which he felt a distaste previously. 



The diet satisfied hunger ; there was no sinking or craving for other 

 kind of food, but it was monotonous, and neither man wished to con- 

 tinue it. 



Exercise. — During these two days the men took the following amount 

 of walking-exercise, on level ground. On the first day the exercise com- 

 menced at 9 A.M., and lasted till 7.45 p.m. with intervals. On the second 

 day it commenced at 9 a.m., and lasted till 9 p.m. The men then went to 

 bed. 



First day. — 23*76 miles=38*23 kilometres. 



The work done was calculated according to Professor Haughton's for- 



