Designed mainly for class room use in connection with one of the introductory manuals on the subject of Money and Banking or of Money and Currency, this volume, in itself, lays no claim to completeness. Where its use is contemplated the problems of emphasis and proportion are, accordingly, to be solved by the selection of one or another of the available texts, or by the choice of supplementary lecture topics and materials. The contents of the introductory manuals are so divergent in character as to render possible combinations of text and readings that will include, it is hoped, matter of such range and variety as may be desired. Fullness of treatment has been attempted, however, in the chapters dealing with the important recent developments in the "mechanism of exchange," and my aim has been throughout to select and, in many instances, to adapt with a view to meeting the wants of those who are interested chiefly in the modern phases of the subject. For valuable suggestions in the preparation of the volume I am greatly indebted to Professors F. H. Dixon and G. R. Wicker and Mr. J. M. Shortliffe of Dartmouth, Professor Hastings Lyon of Columbia, Professor E. E. Day of Harvard, and to my former teacher, Professor F. R. Fairchild of Yale. I desire also to mention my great obligation to authors and publishers who alike have generously permitted the reproduction of copyrighted material.