DOMAIN X. TRANSILIENT. 



composition of the former. It must however in 

 candour be added, that after his visit to Auvergne, 

 where he was unexpectedly convinced of the vol- 

 canic nature of the products of that country*, 

 Daubuisson hesitated concerning even the ba- 

 salts of Saxony, and hinted to the author that 

 they might be volcanic, but, as resting on the 

 summits of hills, of an antiquity altogether in- 

 conceivable. 



NOME V. WACKEN AND CLAY. 

 This transition has been before described. 



NOME VI. JASPER AND KERALITE. 







This transition, according to Patrin, is com- 

 mon in Siberia. The author has seen specimens, 

 in the collection of that celebrated traveller, of 

 keralite translucent on the edge, joined with 

 opake jasper. The colours also correspond; 

 but in the keralite they are pale. This transi- 

 tion seems to depend on the greater or smaller 

 quantity of iron, a chief constituent in jasper. 



* See his papers in the Journal de Physique ; and here Dom. I* 

 Mode Basaltin. 



