Bocas Tardna and Matuntiibo discharge much greater volumes of water than any of the others; consequentlyj the balance of power between their streams, and the waters of the gulf, takes place at greater distances from the shore ; making the most dangerous parts of their bars at about a mile outside of their entrance into the sea. Any attempt to improve either of these mouths, (or that of Pava or CandeMria,) so as to be, at all times, available for vessels of but six feet draft, would not only be attended with great expense; but would, in my opinion, involve the utmost hazard of ifailure. I have no hesitation in admitting that I am unacquainted with any scheme that can be confidently recommended for the permanent accomplishment of that purposeand shall, therefore, not occupy time in discussing the various expedients that might be supposed applicable. All attempts of the kind, under similar circumstances, have proved signal failures; and the resources of engineering science afford no aid in cases of such magnitade as would be involved in this instance. The other, and smaller mouths lying further inside the Gulf of Urabd are also subject, though in a less degree, to-the same class of impediments. The one which I regard as most susceptible of improvement

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23~ footpaths. :But if a flanched wheel be preferred, then I think the form of the rail in Fig. 2 is better suited to meet the various requirements of