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Published online by Cambridge University Press: 14 March 2018
My contribution to the Exeter meeting consisted of two parts: (1) a summaryof the X-ray work done at the Macaulay Institute for Soil Research inAberdeen, on complexes of montmorillonite and halloysite with organicliquids; (2) a discussion of the free energy relations in such complexes.The second part was similar in scope to the contribution to the recent ClayMinerals Group meeting, so this account will be confined to the firstsubject. A brief account of it is justified, for although a full paper is inprint, it has not yet appeared (Trans. Faraday Soc.).