Abstract
PROF. JUDD'S excellent paper in the current issue of the Quarterly Journal of the Geological Society (p. 536) calls to my mind some common and similar examples among the “elvans” of Cornwall (which are dykes in the ordinary acceptation of the term), and but little has been published offering some explanation of their bearing on surrounding rocks. I have observed, notably in the district of Cligga Head (nine miles N.W. of Truro), the marked difference between the structures exhibited by dykes in the parts in contact with the rock through which they intrude (in the Cligga instance Devonian slate), and their centre, amounting almost to a rock distinction.
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