ON RESPIRATION. 341 



The 66 remaining with the animal at the close of the ex- 

 periment may be considered as very nearly the same as 

 No. 3. 



In this, as in the former experiment, we observed, that the Less carbonic 

 evolution of carbonic acid was greatest at the middle of the durine sleep. 

 time, but was considerably diminished toward the end, as the 

 pig became sleepy ; it is not improbable therefore, that dur- 

 ing sleep, less carbonic acid is evolved than when the animal 

 is exercising all its faculties. 



When atmospheric air alone is respired, we have uniformly More carbonic 

 found, that the carbonic acid evolved, added to the oxieren ^^'^ evolved 



. . .... . ^^^" oyigen 



remaining, exactly equalled the oxigen existing in the air consumed. 

 before it was respired ; but in the present instance it was one 

 per cent more, a circumstance which we are at present unable 

 to account for, but it was constantly the case in all the three 

 trials. 



Calculation for Azote. 

 From the foregoing statement we are enabled to ascer- Calculation for 

 tain (he quantities of azote, both before and after the ex- 

 periment. 



Azote before the Experiment. 

 66 cub. inches atmospheric air, with the animal, 



tained J^r7 or - - - S'i'U 



750 



816 total gas employed 101.64 

 The total azote before the experiment was therefore 101-64 

 cubic inches. 



Azote after the Experiment. 

 Respired during 



No. 1. 250. 15 min. 100 : 45 :: 250 : 112-50 



2. 250. 13 min. 100 : 10-4 : : 250 : 26 



3. 250. 17 min. 100 : 6-5 :: 250 : 16-25 



GG- 100 : 6-5 : : 66 : 4*29 



SIG 45 min. Azote after experiment 159-04 

 Ditto before 101-64 



Increase of azote 57-40 



Calculation 



