RECENT DEVELOPMENTS IN EIDETICS, WITH PARTICULAR REFERENCE TO THE GENERAL PSYCHOLOGY OF THE SENSES AND TO TYPOLOGY
I HAVE much pleasure in adding a few words on recent developments to the English edition of the Eidetik, which my pupil and friend, Oscar Oeser, has prepared.
The first edition of this small book has been far better received than I hoped or expected. In particular it has brought me many external collaborators. In testimony of this there are the numerous publications on eidetic imagery, which every month continue to swell the already large volume of literature on the subject. "Die Sache ist in Fluss gekommen," as the German has it. I could have included all the recent publications in the body of this English edition. But even then only a particular phase would have been described; and to-morrow that will have been replaced by a new one. I have therefore preferred to leave the book in the form in which it has had its influence on science and in which it has become a part of science. But I wish to indicate here the general directions that this work has taken in psychological, medical, and philosophic fields.
I have always been of opinion that the growth of science takes place chiefly in the fields that lie along the dividing line between one science and another, and I have therefore always had a predilection for working at problems in which