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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Madam How and Lady Why by Charles Kingsley: because it is too full of quartz--that is, flint.
Think of this the next time you go through Scotland in the
railway, especially when you get near Edinburgh. As you run
through the Lothians, with their noble crops of corn, and roots,
and grasses--and their great homesteads, each with its engine
chimney, which makes steam do the work of men--you will see rising
out of the plain, hills of dark rock, sometimes in single knobs,
like Berwick Law or Stirling Crag--sometimes in noble ranges, like
Arthur's Seat, or the Sidlaws, or the Ochils. Think what these
black bare lumps of whinstone are, and what they do. Remember
they are mines--not gold mines, but something richer still--food
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