B04 W. ©. Kerr—Action of Frost in the 
Among the inferences from the above conclusion, in the way 
of a corollary, is this important one, that the deep decomposition 
, 18. e 
the rocks of these latitudes has 
been effected entirely in post-glacial 
course excludes any theory like that sometimes broached, 
which undertakes to account for this phenomenon, by invoking 
a of a palesval atmosphere surcharged with carbonic 
acid. 
As already stated incidentally, the gold gravels, or placers, 
of this State, of which there are several hundred square miles, 
belong to this class of frost drifts. The miners in these de- 
sits usually wash only the lower stratum of “gravel,” or peb- 
les, which lies against the bed rock, or slate, together with an 
inch or two of the surface of this slate on which the coarser 
which penetrate the more thin-bedded mica schists. As these 
are disintegrated and broken down and moved, in the manner 
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