30 

 acid gas produced is not equal to the oxygen consumed. 



5. That the same number of animals confined in 

 oxygen, the same space of time, under similar circum- 

 stances, consume more of it than when confined in 

 atmospheric air. 



6. That nitrogen is less noxious to them than any 

 of the gases that are fatal to animal life. 



I. That fixed air is most deleterious to them. 



8. That muriatic acid gas disorganizes their 

 structures. 



9. That the flammable air is also very noxious to 

 them. 



10. That the temperature of the air accelerates 

 the consumption of the oiygen, and also the death of 

 the animals. 



I I. That the florid colour of the blood is owing to 

 the combination of oxygen with it. 



These phcenomena have the greatest analog)' to res- 

 piration. If we confine a quadruped in common air 

 the oxygen is destroyed. Worms perform precisely 

 the same operation. From the similarity of effects we 

 must ascribe a similarity of causes : And hence the 

 theory of modern chemistry is applicable to these 

 animals. 



