gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1928.021.122.01 The Age and Composition of the Whin Sill and the Related Dikes of the North of England1 Holmes Arthur D.Sc., A.R.C.S., F.G.S. Professor of Geology, The University, Durham Harwood H. F. M.Sc., Ph.D., A.I.C. Lecturer in Chemistry, Imperial College, London.

The chemical analyses and calculations of norms have been made by Dr. Harwood. The field work and petrological investigations have been carried out by Professor Holmes, who is also responsible for the writing of the paper.

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