6 ORDER OF ARRANGEMENT. [Ch. I. 



In the arrangement of these details the following order 

 has been adopted : 



1 . A description of the various kinds of granitic rocks, and 

 the modes in which they are associated together. 



2. Of the primary schistose rocks, under the same re- 

 lations. 



3. Of the structure of the primary rocks. 



4. Of the nature of the primary rocks, both granitic and 

 schistose, at their junction with each other. 



5. Of the modes in which these rocks are intermixed and 

 connected together. 



6. Of the mineral and metalliferous veins by which these 

 rocks are traversed. 



Having thus premised the nature of the arrangement, it is 

 now proposed to enter on the subject without farther preface. 



