Taking Lake Nicaragua as the point for the communication between the two seas, the calculations which have been made as to periods and distances connected with the conveyance of mails from Europe, in order to cross the Pacific, will not be materially different from those which would arise were Panama to be chosen as the point of communication. Confining every thing to this route, it is necessary to consider and to show what advantage trade and commerce would derive from it; what extent of commerce would pass through this line of communication;, and what revenue could reasonably, and with propriety, be raised therefrom, in order to prove a remuneration for the (p. 101) expense of the undertaking. The official records of British trade and commerce, and also the official records of the trade and commerce of the United States, will enable us to estimate these points just alluded to, for the present period, with considerable accuracy. From both records, the following extent and amount of imports and exports, and tonnage, engaged in transporting these, are selected; premising that, as regards both countries, the value of each is, without either freight or charges: and as regards the former, viz. Great Britain, the value taken is what is denominated, in the Customs return, "_the declared value_," and which, exclusive of freight and charges, is considerably below the real amount. The commerce of both states mentioned, with all the countries about to be enumerated, would most certainly pass through the channel already alluded to, besides a considerable portion more from other countries, but which is uncertain. _Great Britain with_ Exports. Imports. Tonnage Tonnage 1834 1833 Inwards. Outwards.