G26 ADDITIONS. 



In general the insulation of the new simple substances, the metallic 

 bases of the earths, and the like, their separation from their combina- 

 tions, and the exhibition of them in a metallic form has been a diffi- 

 cult chemical process, and has rarely been executed on any considera 

 ble scale. But in the case of Aluminium, the basis of the earth 

 Alumina, the process of its extraction has recently been so much 

 facilitated, that the metal can be produced in abundance. This being 

 the case, it will probably soon be applied to special economical uaea, 

 for which it is fitted by possessing special properties. 



