The fifth edition being exhausted, I have prepared a sixth and probably final one. During the six years which have elapsed since the last edition steady progress has been made in the spread of professional interest in psycho-therapy. Many misconceptions have been swept away, and the practice of hypnotism has become widespread, respectable, and almost humdrum. From it has arisen a new form of psycho-therapy, introduced by Professor Sigismund Freud, of Vienna - Psycho-analysis. I am convinced of the great importance of this form of treatment, and it may take the place of hypnotic suggestion in many obscure and baffling cases, but there is room for both and, I think, for their combination.

I have been fortunate in obtaining the collaboration of Dr. Constance Long, who has made an attentive study of Freud's theories, and has considerable experience of their practical application.

The chief events concerning us since the last edition are : The lamented death of Sir Francis Cruise, ever our stanch supporter; the growth of the Psycho-Medical Society, the foundation of which was alluded to in the last edition, and which now numbers over a hundred and fifty members, under the presidency of Dr. T. W. Mitchell, with Dr. Douglas Bryan, of Leicester, as Hon. Secretary; the establishment of clinics in London and Liverpool for the treatment of necessitous patients and the instruction of medical inquirers.

I have made a good many alterations in this edition, eliminating and curtailing much which has become commonplace knowledge, and adding a good deal of matter drawn from my personal experience of thirty years' practice of hypnotism. The book has always had one object in view : To arouse an interest in the mind of the general practitioner in the study of psycho-therapy, and induce him to use it in his own and his patients' interests.

Kindly acknowledgments from hundreds of medical men from all parts of the world afford gratifying proof of the attainment of this purpose.

My thanks are due to Dr. Dalrymple Marriner for kindly correcting proofs and other help.

C. L. T.

47. Upper Brook Street, London, W.

October, 1913.