Professor Bergson has himself expressed his approval of the general form of treatment, and I am indebted to him for information on a number of points. To Dr. Gillespie, Professor of Philosophy at Leeds, I am indebted for a discussion Of most of the ms. Following the reading of it. My thanks are also due to Miss Margaret Linn, whose energetic and careful assistance in preparing the ms. For the press was invaluable. I wish also to acknowledge kindness shown in supplying information on certain points in connexion with the bibliography by Mr. F. C. Nicholson, Librarian of the University of Edinburgh, by Mr. R. Rye, Librarian to the University of London, and by the University of London Press. I am grateful to Professor Bergson and to the Delegates of the Oxford University Press for permission to quote from La Perception du Changement, the lectures given at Oxford. Further I must acknowledge permission accorded to me by the English publishers of Bergson's works to quote passages directly from these authorized translations — To Messrs. Geo. Allen Unwin, Ltd. (time and Free Will and Matter and Memory), to Messrs. Macmillan co., Ltd. (creative Evolution, Laughter, Introduction to Met'a physics), and to T. Fisher Unwinh Ltd. (dreams). Through the kindness of M. Louis Michaud, the Paris publisher, I have been enabled to reproduce (from his volume of selections, Henri Bergson: Choix de textes et etude de systeme philosophique, Gillouin) a photograph of Bergson hitherto unpublished in this country.
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