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.