Page:Theophrastus - History of Stones - Hill (1774).djvu/69

 XXII. It is aid alo, that on expoing to the Sun's Rays ome are wholly dried up; o as to be rendered ueles, unles macerated and impregnated again with Moiture: while others by the ame means become ofter and more brittle. It is evident that the Humidity is extracted in both thee Caes; the Difference is, that the more dene and compact Stones harden by this drying; whereas the looer, and thoe of a les firm Texture, become more brittle and oft by it.

XXIII. Some of the more brittle Stones there alo are, which become as it were burning Coals, when put into a Fire, and continue o a long time: of this Kind are thoe about Bena, found