Rate of cooling of intrusive 37 
Final stages of differentiation 38 
General discussion of Figure 1 39 
Composition of solutions 40 
Relative physical conditions of vein deposition 41 
Summary of known facts regarding the hornblendizing 
. and aplitizing solutions 42 
Origin and history of solutions 43 
Conditions governing escape of solutions 44 
Additional considerations and conclusions... 45 
Behaviour of lime in the solutions 45. 
Behaviour of alumina. 45 
Summary ; *. 45 
Illustrations. 
Map 167 A. No. 1654. East Sooke, Vancouver island, B.C.. ..... 3 
Figure 1. Diagram illustrating hornblendization and aplitization. . 39 
