Undoubtedly one great reason which encouraged the people of the island in their delusion was the circumstance that the Government promises to pay, although they had ceased to represent accumulation, or a definite equivalent of any thing in particular, did not thereby cease to be instrumentalities for effecting exchanges; but, on the contrary, continued to constitute great labor-saving machines, performing a work precisely similar in character to that performed by a ship or a locomotive--namely, the removal of obstacles between the producer and consumer. But, in becoming a representative of a debt to be paid in place of representing a means of paying a debt, the new currency lost at once the really most important quality of good money; inasmuch as it ceased to be a common equivalent, or in itself an object of value in exchange, and therefore became incapable of properly discharging the function of a standard, or measure, for estimating the comparative value of other things; resembling, in this deficiency, a ship without a rudder, or a locomotive without a track to run on. The removal of a rudder from a ship, or the taking up the track in front of a locomotive does not impair the capacity of the one for cargo, or the power of the other for pulling. But if it is attempted to use a ship or a locomotive under such circumstances for the purposes for which they were constructed--i.e., as agencies for effecting and facilitating exchanges--the result of their work will be so uncertain and hazardous that the owners of the things to be exchanged would require large insurance against the possible action of the exchanging agencies. And so it was with this blueback currency of the island, which, ceasing to represent or be convertible on demand into a constant quantity of any commodity, ceased to be a constant equivalent or measure of value of any thing.