labourers inured to the climate, but the inertness of the natives renders it inexpedient to rely upon them alone; although, working in conjunction with Europeans, and stimulated by their example, and by the love of gain, their services may, no doubt, be made available. There is, however, no difficulty in collecting from the Southern States of North America a sufficient number of Irish labourers inured to a tropical climate, as was lately clearly shewn by the formation of a railway at the Havanna, which was almost entirely constructed by this class of men.
Any deficiency of labourers, it is considered, could easily be drawn from the mining districts of Cornwall, from Ireland itself, or from Scotland, or the North of England.
The next consideration is the expense of constructing a Ship Canal across the Isthmus, and the probable returns. The estimates which have been made, and of which the result is given below, suppose the Canal to be cut through the whole width of the Isthmus, from the Bay of Li