of Carbonic Acid, tyc. 

 July 31, 1866. Day of rest. 



31 



Time of day. 



Eliminated 



Absorbed 



For every 100 

 parts of oxygen 



absorbed there 

 are in the carbo- 

 nic acid separated 



Carbonic 

 acid. 



Water. 



Urea. 



oxygen. 



From 6 a.m. to 6 p.m. 

 From 6 p.m. to 6 a.m. 



grm. 

 532-9 

 378-6 



grm. 



344-4 



483-6 



grm. 

 21-7 

 15-5 



grm. 

 234-6 



474-8 



175 



58 



In 24 hours 



911-5 



828-0 



372 



708-9 



94 





August 3, 1866. Working-day. 



From 6 a.m. to 6 p.m. 

 From 6 p.m. to 6 a.m. 



884-6 

 399-6 



1094-8 

 9473 



20-1 

 16-9 



294-8 

 659-7 



218 

 44 





1284-2 



20421 



37-0 



954-5 



98 









It follows from these results that the elimination of carbonic 

 acid is greater at day than during the night ; further, that on a 

 working-day the quantity of carbonic acid and water eliminated 

 is far greater than on a day of rest, while the quantity of oxygen 

 absorbed on both days is pretty equal. In return, however, for 

 this the quantity of oxygen absorbed during the night which 

 follows the working-day is greater. The authors deduce there- 

 from the following conclusions : — The oxygen absorbed during 

 the night is, so to speak, stored up to be used on the folio wing- 

 day for the complete oxidation of the food to carbonic acid. The 

 oxygen in the water excreted is, for the most part, already con- 

 tained in the mixed food used as diet. If a man works during 

 the day, the excretion of carbonic acid and the consumption of 

 the previously accumulated oxygen is considerable ; the oxygen 

 consumed is replaced during sleep by an increase in the quantity 

 inspired, and thus the material for new exertions of force is 

 again collected. On a day of rest the excretion of carbonic acid 

 and of water is smaller, but still considerably greater than cor- 

 responds to the quantity of oxygen which is taken in during 

 breathing. The absorbed oxygen therefore remains several 

 hours in the body, where it probably furthers a slow oxidizing 

 process before it is again excreted as carbonic acid and water. 

 Both on the day of rest and in the night following the day, the 

 quantity of carbonic acid inspired is small and equable, corre- 

 sponding to the small and equable muscular motions made during 

 sleep. The exhalation of aqueous vapour and the perspiration, 

 however, are far greater in the night after the working- day 

 than after the day of rest ; this probably brings about the com- 



