290 The Relation of Excised, Muscle to Acids, Salts, and Bases. 



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A Theory of Colour Vision. 



By K. A. Houstoun, M.A., Ph.D., D.Sc, Lecturer on Physical Optics in the 



University of Glasgow. 



(Communicated by Prof. A. Gray, F.E.S. Received April 3, 1916.) 



[This Paper is published in 'Proceedings,' Series A, No. 642, July 1, 1916.] 



