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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 summary of the X-ray work done at the Macaulay Institute for Soil Research in Aberdeen, on complexes of montmorillonite and halloysite with organic liquids; (2) a discussion of the free energy relations in such complexes. The second part was similar in scope to the contribution to the recent Clay Minerals Group meeting, so this account will be confined to the first subject. A brief account of it is justified, for although a full paper is in print, it has not yet appeared (Trans. Faraday Soc.).