any respect, either upon the good will of those who issued them, or upon a condition which the holder of the notes might not always have it in his power to fulfil; or of which the payment was not exigible till after a certain number of years, and which in the meantime bore no interest. Such a paper money would, no doubt, fall more or less below the value of gold and silver, according as the difficulty or uncertainty of obtaining immediate payment was supposed to be greater or less; or according to the greater or less distance of time at which payment was exigible.

Some years ago the different banking companies of Scotland were in the practice of inserting into their bank notes, what they called an Optional Clause, by which they promised payment to the bearer, either as soon as the note should be presented, or, in the