DOMAIN tv. TALCO^S. 



serpentine, by the grain being finer and fatter; 

 and is more easily cut with a knife. 

 That of Chiavenna has been analysed by 

 Weigleb, who found, magnesia 38, silex 38, 

 argil 6, iron 15. Who would suppose, after this 

 analysis, that Werner should place this sub- 

 stance among the argillaceous, with an equal 

 contempt for chemical principles, which can 

 alone afford any solid foundation for the science, 

 as when he places (he corindon gems among 

 the siliceous, though they do not contain one 

 atom of silex ! The paternal love of his own 

 system must be violent indeed, when it leads to 

 such contempt of every principle on which the 

 science has been founded. 



This substance has commonly been called 

 lapis ollaris, which"has been translated pot-stone, 

 from the use to which it has been applied, even 

 Ancient. f rom remote antiquity, Pliny mentioning that 

 the stone of the isle of Siphnus, in the Grecian 

 Archipelago, and the greenish stone of Como, 

 in Italy, were both used in his time to make 

 vessels for cooking food. Wad, in his account 

 of the Borgian museum, mentions several Egyp- 

 tian monuments of ollite, chiefly small statues. 

 The varieties are : 



Ollite, of a blackish green, with grass green 

 spots. 



