Note: Much has been written on the subject of the binaural location of pure tones but the case of complex sounds has received little attention in recent literature. The purpose of the present paper is to bring the discussion of complex sounds abreast of that relating to pure tones. Those who wish to acquaint themselves with the work on pure tones will be interested in reading the theoretical work of the authors and the experimental studies carried out by G. W. Stewart and students working under his direction. This work has been reported in various papers, most of which have appeared during recent years in the Physical Review and the Physikalische Zeitschrift. A resume of the present paper is given by the authors in their concluding paragraph. — Editor.