260 Dr. Hitchcock on some Phenomena of Drift. 
width is about the same as the other. 
Between the trains, and 
in other parts of the town, we meet occasionally with a block o 
the same kind as the trains: but they are rare; though Dr. Reid, 
thinks it possible that a third train may be found in the south 
part of the town, where he has observed the blocks to be more 
numerous, 
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