It is true, I met with it on my return
by the east coast, when I just saw it, and no more, at Peterhead and
Aberdeen; but that was all the granite I had ever seen when I wrote
my Theory of the Earth. I have, since that time, seen it in different
places; because I went on purpose to examine it, as I shall have
occasion to describe in the course of this work.
I may now with some confidence affirm, from my own observation, and from
good information with regard to those places where I have not been,
except the northwest corner, I may affirm, I say, that instead of the
basis of the greatest part of Scotland being a granitic rock, which our
author has maintained as an evident thing, there is very little of it
that is so; not perhaps one five hundred part. So far also as I am to
judge from my knowledge of the mineral construction of England and
Wales, which I have examined with the greatest care, and from the
mineral chart which my friend Mr Watt made for me from his knowledge of
Cornwall, I would say that there is scarcely one five hundred part
of Britain that has granite for its basis.
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