NITROGEN. 79 



Water . . . . . . .9 



Nitric Acid 54 



Carbonic Oxide 14 



Carbonic Acid 22 



Sulphurous Acid 32 



Sulphuric Acid 40 



Phosphoric Acid 71 



Muriatic Acid 36 



Sulphuretted Hydrogen . . . .17 

 Carburetted Hydrogen .... 8 



Ammonia 17 



Potash 47 



Soda . 31 



Lime .28 



Magnesia 20 



Silica 46 



Alumina .51 



Prot-oxide of Iron 35 



145. When plants or vegetable substances consist- 

 ing of oxygen, hydrogen, and carbon, decay, their 

 elements form new compounds, the principal of which 

 are carbonic acid and water. We must now consider 

 what are the products resulting from the decay of 

 animal matters, and of those vegetable substances 

 which, like them, consist of oxygen, hydrogen, car- 

 bon, and nitrogen; these are water, carbonic acid, 

 and ammonia. 



146. Nitrogen or azote differs from most other 

 substances in appearing to be remarkably inert; it 

 seems to have little or no affinity for any other sub- 

 stance. It is always mixed with oxygen in the air, but 

 it appears to have no inclination to combine with it; 



i 



