T. S. Hunt—The Decay of Rocks. 213 
CONCLUSIONS. 
Sth. That the rounded masses of crystalline rock left in the 
tee of decay constitute not only the bowlders of the drift, 
ut, judging from analogy, the similar masses in conglomerates 
-Of various ages, going back to EKozoic time; and that not only 
the forms of these detached masses, but the outlines of eroded 
regions of crystalline rocks, were determined by the preceding 
‘Process of sub-aérial decay of these rocks. 
