424 On Respiration. 



From these 3 



Deduct *3 for azote in the ] parts oxygen^ 



Leaves 2*7 for the azote contained in 20 



parts of the residual 77- 



20 : 2-7 :: 77 : 10-4 

 No. 2. therefore consisted in 100 parts, of 

 7' 5 carbonic acid 

 15"5 oxygen 

 10*4 azote 

 66-6 hydrogen 



100 



No. 3. 250. Respired during seventeen minutes j ex- 

 amined as above, consisted in 100 parts, of 

 6 carbonic acid 

 1 7 oxygen 

 6'5 azote 

 70*3 hydrogen 



100 



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 evolution of carbonic acid was greatest at the middle of 

 the time, but was considerably diminished toward the end, 

 as the pig became sleepy ; it is not improbable, therefore, 

 that during sleep less carbonic acid is evolved than when 

 the animal is exercising all its facuhies. 



When atmospheric air alone is respired, we have uni- 

 formly found, that the carbonic acid evolved, added to the 

 oxygen remaining, exactly equalled the oxygen existing in 

 the air 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 th? 

 case in all the three trials. 



Calculation for Azote, 



From the foregoing statement we are enabled to ascer- 

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

 periment. 



Azoii 



