DOMAIN X. 



TRANSILIENT. 



HIS division includes the rocks which Distinct fi*m 

 suddenly pass from one to another, so that 

 specimens may sometimes even appear in 

 cabinets ; while the Transitive rocks com- 

 monly occur in a slow and scarcely visible 

 progress; the term implying, in Werner's 

 system, those intermediate between the 

 Primitive and Secondary. The suddenness 



M 



