To the above should be added all the specie sent both by Great Britain and the United States to the Eastern World, particularly to China, to purchase cargoes, from the States alone about 7,000,000 dolls.; also all the tonnage which goes, or would go, from one coast to another in the three republics of Venezuela, Guatemala, and Mexico. To these states, such a communication would prove of inestimable value, and tend very greatly to add to the revenue to be obtained from the (p. 104) traffic by it. There are other nations, also, besides Great Britain and the United States, which traffic with the quarters of the world already specifically alluded to, particularly France, Spain, and Holland; but no accurate account of such trade has hitherto come in the writer's way; though, taken collectively, it must be to a considerable amount. Moreover, the whole trade between Holland and Java, and between Spain and the Philippine Islands, would pass by the channel under consideration, and the trade which both nations has with these places is well known to be very considerable. Such as it has been described is the trade at this moment; a sure foundation upon which the magnificent undertaking under consideration would, at the outset, have to build. The increased and increasing communications through the grand thoroughfare goes beyond calculation, and would most certainly exceed every thing that ever has been seen, or that ever can be witnessed, in any other portion of this globe. The trade of mighty empires would sink into insignificance, when compared, in all their present magnitude, with what it would become one hundred years hence. Admitting that it cost 1,000,000_l._ to complete the navigable communication, (and there are good grounds to believe that it could be done for one-half of the sum,) the question or point next to be considered is, what would the revenue be, which could be derived from it? To exact a per centage on the value of the commerce which passes through it would be uncertain, and liable to evasion, and consequently give much trouble, and occasion much vexation; and therefore it would be best to exact so much per ton, the exact extent of which the register of each ship or vessel so passing through the canal would at once and readily determine. The question is, What should the sum so levied, or the toll, actually come to be? Ten shillings per ton would certainly be a moderate sum; and taking it so it will be shown how it will pay at the outset. _Cost and Revenue._ (p. 105)