The steam-boats to be employed in the service contemplated, although of the high power mentioned, need not be of the same tonnage as vessels of an equal power which are built for the sole purpose of carrying goods. Consequently, a considerable expense in building the former will be saved. Mails never can be carried either with regularity or certainty in vessels, the chief object and dependence of which is to carry merchandize. The time which such vessels would require to procure, take in, and discharge cargoes, would render punctuality and regularity, two things indispensably necessary in all mail communications, quite impracticable. Any attempt to resort to such a system, more especially in a quarter where steamers would have so many places to call at as these will have in the West Indies, would throw every thing into inextricable confusion. Steam-boats carrying mails and passengers should be the mail-coaches of the ocean, limited as mail-coaches on land are to cargoes, and as near as possible to the tonnage pointed out in the following pages. The steamers to be employed in the service contemplated should also be built broad in the beam, of a light draught of water, and in speed, accommodation, and (p. xi) security, must be such that no others of equal powers can surpass them. The liberality of MR. JOHN ARROWSMITH, so well known for his geographical knowledge and geographical accuracy, has enabled me, without the labour of constructing it, to present to you and to the public the Chart of the World, between 70 deg. N. lat. and 60 deg. S. lat., on Mercator's projection, which accompanies the present sheets. On it I have laid down all the routes of both steamers and sailing-packets, to every quarter of the world that has been adverted to; and further added a Chart of the West Indies, and of the Isthmus of America, drawn by myself, and corrected by the latest authorities. The timid and the interested will throw every doubt upon the success of such an undertaking. What is going on in the world is the best answer to doubts and fears on this subject. What takes place in other quarters will take place in the quarters alluded to, namely, success where failure was anticipated. In a vast undertaking like the plan proposed, the interests of the Government and the general interests of the public must be specially kept in view and particularly attended to. By attending closely to these interests, the Government will find that it best and most effectually consults the interests of individuals, places and communities. No partial or local interest or opposition (such may (p. xii) in this, as in most other concerns, appear) ought to be listened to. Any such opposition can only proceed from prejudice, or ignorance, or self-interest; and a little experience will satisfy the public, and convince even such opposition, that the fact is so; and, moreover, that in the arrangements proposed, no interest in any quarter has been neglected.