Engineers have ever judged the scheme practicable, and the estimate of the necessary works, signed by several skilful surveyors, was submitted to the ministry of that day. The amount was forty-six millions of livres (circa £1,916,600 sterling). But what can compensate for the absence of the tide? This is an advantage, which, in a commercial point of view, must ever insure to London a decided superiority over Paris. Were the Seine to-morrow rendered navigable for vessels of large burden, they must, for a considerable distance, be tracked against the stream, or wait till a succession of favourable winds had enabled them to stem it through its various windings; whereas nothing can be more favourable to navigation than the position of London. It has every advantage of a sea-port without its dangers. Had it been placed lower down, that is, nearer to the mouth of the Thames, it would have been more exposed to the insults of a foreign enemy, and also to the insalubrious exhalations of the swampy marshes. Had it been situated higher up the river, it would have been inaccessible to ships of large burden. Thus, by no effort of human invention or industry can Paris rival London in commerce, even on the supposition that France could produce as many men possessed of the capital and spirit of enterprise, for which our British merchants are at present unrivalled. Yet, may not this pre-eminence in commercial prosperity lead to our destruction, as the gigantic conquests of France may also pave the way to her ruin? Alas! the experience of ages proves this melancholy truth, which has also been repeated by Raynal: "Commerce," says that celebrated writer, "in the end finds its ruin in the riches which it accumulates, as every powerful state lays the foundation of its own destruction in extending its conquests." LETTER XXXIV. _Paris, December 16, 1801._ No part of the engagement into which I have entered with you, so fully convinces me of my want of reflection, and shews that my zeal, at the time, got the better of my judgment, as my promising you some ideas on FRENCH LITERATURE. It would, I now perceive, be necessary to have inhabited France for several years past, with the determined intention of observing this great empire solely in that single point of view, to be able to keep my word in a manner worthy of you and of the subject. It would be necessary to write a large volume of rational things; and, in a letter, I ought to relate them with conciseness and truth; draw sketches with rapidity, but clearness; in short, express positive results, without deviating from abstractions and generalities, since you require from me, on this subject, no more than a letter, and not a book.