NOME XX. SALINE ROCKS. 141 



supports and traverses of doors and windows, re- 

 sisting the air a considerable time. It is to be 

 presumed that mines may be discovered in this 

 district, though nothing in that way has been 

 attempted. Some cubic pyrites, yellow or black 

 on the surface, give no strong hope in that 

 respect." 



Some important rocks must now be consider- 

 ed, which are not only anomalous in their struc- 

 ture, as the preceding ; but of which the whole 

 mass forms a deviation from the usual order of 

 nature. Such are, as above mentioned, the Sa- 

 line, Bituminous, Sulphuric, and Iron Rocks. 



NOME XX. SALINE ROCKS. 



The most remarkable of these exist in Spain 

 and Africa. The latter saline hill can only be 

 said to have been observed; but those of Spain 

 have been described by Bowles, in his natural 

 history of that country*. The first is in Spanish 

 Navarre, between Caparoso and the river Ebro, 

 in a chain of hills which extend from east to 

 west. 



* See the French translation, by Viscount Flavigny, Paris 1776, 

 8vo. p. 376, 406. 



