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Published online by Cambridge University Press: 01 May 2009
About a year ago my friend Professor Dobbie, of the University College of North Wales, drew my attention to the remarkable experiments of Sir W. Roberts-Austen (whose premature death we must lament as a very great loss to science) on the diffusion of solid metals, suggesting that they might have some geological application. The phenomena referred to in this paper, in which I have been very keenly interested ever since my work as a Geological Surveyor in Eastern Sutherland, occurred to my mind at the time as a probable case; but after some reflection certain difficulties began to appear, and I put the subject aside for a while. The very suggestive address of General McMahon to the Geological Section of the British Association at Belfast has reawakened my interest; and it seems to me worth while to put forward some considerations on the matter, somewhat speculative indeed, but which may perhaps be of service in stimulating research on a fascinating though difficult subject.
page 207 note 1 Prichard, H. H.: “Through the Heart of Patagonia” (1902), pp. 189Google Scholar , 203, 254.
page 207 note 2 Roberts-Austen, : Bakerian Lecture, Phil. Trans., 1896, vol. clxxxvii Proc. Roy. Soc., Oct. 1900, p. 436.Google Scholar
page 210 note 1 “On Foliated Granites and their relations to the Crystalline Schists in Eastern Sutherland”: Q.J.G.S., 1896. The views of our colleague, the late Hugh Miller, jun., are also given in this paper.
page 210 note 2 I had not at the time this was written read this passage from Lehmann (Enst. Altkryst. Sch., p. 64): “Die Abgrenzung zwischen dem, was als Granit oder Granitgneiss und dem, was als Gneissglimmerschiefer zu bezeichnen wäre, wird oft unmöglich und kommt ganz auf subjectives Ermessen hinans, so schnell wechselt der Gesammtcharakter,” but cannot refrain from quoting it now. I put one phrase in italics.
