DOMAIN X. TRANSILIENT. 



the kindred rocks; and are generally a 

 mere variation of the Mode or Structure ; 

 as the passage from granite to gneiss, or 

 from granite to granitic porphyry. If the 

 granite be surcharged with siderite, and its 

 particles become very small, it may pass 

 into the real basalt of the ancients ; but 

 can never become a basaltin interspersed 

 with chrysolite or zeolite ; and if the ba- 

 saltin occur with granite, it must be merely 

 adherent. Keralite may, by imbibing iron 

 from the atmospheric air, or whatever 

 cause, become jasper. Werner has ob- 

 served, that wacken passes into clay on one 

 hand, and basaltin on the other; which 

 last again passes into basalton or grunstein. 

 Many other undoubted transitions may be 

 observed ; but it will suffice to enumerate 

 some of the most remarkable, leaving the 

 others to time and accurate observation. 



