406 DOMAIN V. CALCAREOUS, 



Others are Conchitic and Zoophytic marbles and 

 bricks. 



PORTUGAL. The mountains of Arrabeda fur- 

 nish some esteemed marbles. That of Troncao is 

 a pale yellow, with grey veins, and sometimes con- 

 tains shells. 



ITALY. The chain of the Apennines being 

 chiefly calcareous, and Italy the seat of numerous 

 ancient monuments, and the parent of modern 

 sculpture and architecture, it is no wonder that 

 the Italian marbles have been highly celebrated. 

 White marble of Padua, Pisa, Pilli, and Biancone, 

 all used in architecture in the north of Italy. The 

 cathedral of Milan is built with a white saline 

 marble, veined with grey, from Mergozzo*. Black 

 marble of Bergamo, of the most pure and intense 

 tint, and finest polish, whence the Italians call it 

 parago?ie. Black of Como,. employed in the ca- 

 thedral of Sienna. Deep black, with pure white 

 veins. Polveroso, or powdered marble of Pistoia, 

 sprinkled with little dots, so as to appear dusty. 

 White, with large black spots, from Lago Mag- 

 giore, used in the decorations of most of the 



* The primitive marble, white, with some veins of grey, and of 

 which the cathedral of Milan is constructed, leaves in the nitrous 

 acid white quartzy sand, with some pyrites and greeuioh siderhe, 

 Sauss. 1/71. 



