Importance of Relations in Space to Geologic Studies.

Some years ago a coal property in Washington territory was offered for sale by shrewd speculators, who valued the land at $1,100 an acre on account of the great thickness of workable coal said to occur in several veins. The property was not developed, but the number of coal beds and a total thickness of good coal of more than one hundred feet were confidently stated from exposures of the folded coal measures in a cañon 400 feet deep, which traversed a plateau whereon glacial drift and primeval forest obscured the strata. Of these natural conditions the speculators skillfully took advantage; they opened the coal beds on the cañon sides at points which were not intervisible, and they cut a labyrinth of paths through the forest leading from one opening to another. On the cliffs these paths were unpleasantly narrow; in the . . .

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