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Some time ago my friend Mr. Jukes-Browne asked me to examine some sand, with a view to ascertaining whether it was derived from Dartmoor. Dartmoor quartzes have so many specific characters that it is often easy to say that a quartz is not derived from that region; but owing to the fact that quartz-veins have not been studied, it is usually impossible to say whence various sands have in fact come.
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page 212 note 1 Hitherto we have been under the necessity of invoking the agency of percolating water.
page 212 note 2 My friend Dr. Horne very kindly read the MS. of this paper, and he gives me leave to say that he agrees with the views expressed in it. Indeed, I believe it would be nearer the truth to say that he had come to similar conclusions before he saw my MS., and had discussed them with my former colleagues of the Scottish Geological Survey.
page 212 note 3 I was unaware at the time that quartz-veins were under discussion in the Magazine.
page 214 note 1 Hannay, J. B.: Proc. R.S., 1881, p. 321.Google Scholar