In the ntso number of this volume of the Scientific American, Hie plan of forming sub-marine foundations by the " Immersive Coffer," invented by Charles Pontez, the owner of Prof. Potf s patent for sinking hollow piles by atmospheric pressure, was illustrated and described. The accompanying engraving forms part of the system, as it is designed to be carried out, and there is no city in the world where the introduction of such an invention would prove of so much benefit, or is so much required, as New York. The figure represents a series of storehouses builtupon strongarch-ed piers, the foundations et which are of solid mason-work, built with the a Immersed Coffer,' fora description ot which we refer to the number of the Scientific American spo- For many years it has been proposed to build permanent wharves in New York, but the great cost has prevented the accomplishment of the desirable object. This system of-fens the means of carrying out the project The wharves now built of a mass of loose etone, could be enclosed m a thick solid wall, and on the permanent base, thus made, substantial warehouses could be erected on iron or granite columns, leaving a clear way on the floor of the wharf, for vehicles, and vessels could directly discharge their cargoes into these warehouses. The revenue deiived from this source would jay more than the interest on the cost of these imperishable structures, and would afford a source of revenue to the city. Every American who has visited Europe by way of Liverpool, has admired the wonderful docks and warehouses of that city. Amid hail and rain, a ship can unload her cargo, and almost roll it from her decks into the storehouses. No city in the world, possessed of such a harbor and such a marine trade (the third greatest sea-port in the world) as New Y0fk,is so destitute of conveniences for the shipment and transhipment of goods, and for We have heard the capiains of vessels say, that "the docks of New York were of the worst description, for convenience, c, and altogether unworthy of such a great seaport and growing city." This assertion no one, who has travelled over a considerable part of the world, will deny, and every New Yorker both feels and knows it to be true. There are too few public conveniences for our shipping interests in this city; Uiis should be remedied, for, in every sense of the term, the city of New York is indebted for her greatness and wealth, to her ship merchants. After this there can be no excuse for not providing good wharves and publicstores on them; the expense of their erection cannot be urged against them, for this plan is both practicable and economical. With our modern improvements and appliances, new wharves and warehouses can be builton this plan of a character inferior to no others in any city in the world. The stores should be of iron, and thus they would be fire-proof—a consideration of the greatest importance. Iron stores could be put up rapidly, and would not cause that confusion along our docks, which brick and stone buildings would. We recommend this improvement to all sea-port cities in ourcoun-try. We have spoken especially of New York city, because we know the great disadvantages under which her shipping merchants labor, for want of proper accommodations for cargoes, while vessels are loading and unloading at our wharves. On some ot our wharves there are miserable wooden sheds, of which every citizen in New York will feel ashamed after seeing this engraving. We specially re-commendthis plan to our City Board of Trade. When we consider that New York City is growing so fast, and her shipping increasing eo rapidly, it would be wisdom for those who are selected by our merchants to watch over the shipping interests of our city—and they arethemostimportant—to test this plan at an early aase. ine extension oi our wnariage can only be accomplished by pushing artificial structures into the present water domain encroachments on sea and river be worthy of the wealth, the enterprise, and wisdom of New York; let us have such wharves and public stores as we can have, by the plan here proposed, which will be the means of affording ample publicaccommodations for merchandise, and save it from being injured by inclement weather during the time of its shipment and unshipment. Much property will also be saved by such wharves and stores, from those depredators, now so common, who live by dock plunder. Gates can be erected to be opened and closed at certain hours, and none but watchmen or those who have pasports be permitted to pass in and out by the watchmen. Some system of this kind, as is well most imperative; it is for our merchants to say when the remedy we suggest will be carried out.