402 CHARACTERISTIC. CLASS I. 



1. PURE. As above. 



Pure Atmospheric- Air. J. ii. 20. 



II. ORDER. WATER. 



I. ATMOSPHERIC-WATER. Without odour or 

 sapidity. 



1. PURE. As above. 



Water. ii. 21. 



III. ORDER. ACID. 



I. CARBONIC-ACID. Taste slightly acid. 



G. = 0-0018. 



1. GASEOUS. Expansible. 

 Taste acidulous, pungent. 



Aeriform Carbonic Acid. J. ii. 22. 



II. MURIATIC- ACID. Odour pungent. 



Taste strongly acid. 

 G. = 0-0023. 



1. GASEOUS. Expansible. 

 Odour pungent. 



Aeriform Muriatic Acid. J. ii. 23. 



III. SULPHURIC-ACID. 



G. = 0-0025 ...1-9. 



