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Rh security not known in the last century." So, in the memory of men yet living, the great inventions that embodied the power of steam and electricity, the railroad and the steamship, the telegraph and the telephone, have built up new customs and new law. Already there is a body of legal literature that deals with the legal problems of the air.

It is, however, not so much in the making of new rules as in the application of old ones that the creative energy of custom most often manifests itself today. General standards of right and duty are established. Custom must determine whether there has been adherence or departure. My partner has the powers that are usual in the trade. They may be so well known that the courts will notice them judicially. Such for illustration is the power of a member of a trading firm to make or indorse negotiable paper in the course of the firm's business. They may be Rh