It may not be necessary to inform readers again that I have aimed in this book to present only the facts bearing on the experiments of the United States with metallic money. No special attention, therefore, has been devoted to the theory of bimetallism or to the larger principles of money involved in current discussions. In a historical study, such as this aims to be, there is neither space nor propriety for an extended treatment of principles. Hence I do not wish to be regarded as having tried to “settle the money question” merely by this book, even though the facts given must necessarily have an important bearing on the acceptance or rejection of current schemes. In due time I hope to present a careful discussion of the principles of money, and also an examination of the logic and theory of bimetallism. [From the Preface to the Fourth Edition]