DOMAIN III. 



ARGILLACEOUS. 



ARGIL. 



J-HIS earth is obtained in the state of 

 greatest purity from alum, which is a mix- 

 ture of argil and sulphuric acid. If it con- 

 tain oxyd of iron, as is frequently the case, 

 it emits a particular smell, when breathed 

 upon, well known by the name of an 

 earthy smell. 



