the person seeking to enforce it has a legitimate interest according to the ordinary understanding of upright men in the community. It is significant that although we have been theorizing about consideration for four centuries, our texts have not agreed upon a formula of consideration, much less our courts upon any consistent scheme of what is consideration and what is not. It means one thing--we are not agreed exactly what--in the law of simple contracts, another in the law of negotiable instruments, another in conveyancing under the Statute of Uses and still another thing--no one knows exactly what--in many cases in equity. Letters of credit afford a striking illustration of the ill-adaptation of our American common law of contract to the needs of modern business in an urban society of highly complex economic organization. Well known abroad and worked out consistently on general theories in the commercial law of Continental Europe, these instruments came into use in this country on a large scale suddenly during the war. There was no settled theory with respect to them in our books and the decisions warranted four or five views leading to divergent results in matters of vital moment to the business man who acted on them. Characteristically the business world set out to make of them formal contracts of the law merchant by the use of certain distinctive words which gave the instruments character and made their nature clear to those who inspected them anywhere in the world. But for a season our category of mercantile specialties had ceased to admit of growth and the doctrine of consideration with its uncertain lines stood in the way of many things which the exigencies of business called for and business men found themselves doing in reliance on each other's business honor and the banker's jealousy of his business credit, with or without assistance from the law. Certainly no one would say that such a situation bears witness to wise social engineering in an economically organized society resting on credit.