324 DOMAIN IV. TALCOUS. 



the other, it is soft, rather heavy, and very fusi- 

 ble, but its glass is black, while that of the other 

 is grey ; it is doubtless a superabundance of iron 

 which gives these pieces their red colour, and 

 causes their glass to be black ; but this iron is 

 under the form of oxyd, or what was called calx ; 

 for neither does this stone affect the magnet. 



" This rock is succeeded by another, smaller, 

 and of the same nature, on which stands a little 

 chapel, dedicated to St. Andrew, which has given 

 it the name of Scoglio di St. Andrea. 



" This rock stretches along the sea; it is 

 afterwards covered by a granular serpentine, 

 similar to that of La Garde, 1342, which, like 

 that, splits in small polyhedral fragments, irre- 

 gular, the faces coloured by ferruginous irides- 

 cences, and which falls like it in decomposition. 

 This same stone is still seen in the ascent beyond 

 Peggi."* 





STRUCTURE I. SOFT STEATITE. 



White soap-rock, from Cornwall. 



The same, mottled with red or blue, from the 

 same country. 



The same, rather harder, from Portsoy, in Scot- 

 land. 



Sauss. 1357- 





