It still remains one of the best presentations of this subject ever made; and what adds to our wonder is that it was not the result of a study of authorities, but was worked out wholly from his own observation and thought. Up to this time there were no authorities and no received doctrine on the subject; there were simply records of financial practice more or less vicious; it was reserved for this young student, in a letter not intended for publication, to lay down for the first time the great law in which the modern world, after all its puzzling and costly experiences, has found safety.