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 ACKNOWLEDGMENTS impulse of which this study of olfaction is the outcome emanated from Sir St. Clair Thomson, who three years ago handed me for my edification and growth in knowledge the Essai d'Olfactique Physiologique, a Thèse de Bruxelles, by A. Heyninx, dated 1919.

Tn addition to that work the following have been utilised, for the scientific side of the subject at all events :— Poncelet, P. P. Chimie du Gout et de l'Odorat, etc. Paris. 1755. Parker, G. H. Smell, Taste, and Allied Senses in the Vertebrates. n.d. Deite, C. Manual of Toilet Soap-Making. Eng. Trans., 2nd ed. London. 1921. Ogle, Wm. Medico-Chir. Trans., Vol. LIII., p. 263. Bonvier, E. L. The Psychic Life of Insects. Eng. Trans. London. 1922.

In Heyninx’s book there is a good bibliography, but the English reader will ſind an excellent résumé of recent scientific literature in Osmics, by Mr. J. H. Kenneth, published by Oliver & Boyd, Edinburgh.

It is impossible in the space at my disposal to print a bibliography dealing with the historical aspect of olfaction.

In addition to my debt to books, I am also under deep obligation to Dr. Wyatt Wingrave, Dr. Amold Renshaw, Mr. Archer Ryland, Mr. F. W. Watkyn-Thomas, and Mr. T. H. Fairbrother, for many valuable hints and criticisms, as well as for much useful information, and I take this opportunity of offering my thanks to them for their kind interest. Rh