This lime very probably comes from the mountains of Ataka, which contain several beds of calcareous marl; and there is no doubt that, by making researches, the beds that supplied the hydraulic lime may be discovered. Samples have been sent to M. Leplay, chief engineer and professor at the School of Mines, for analyzation, and more will be sent until good beds shall be found. On this supposition, it is more than likely that the masonry of the Maritime Canal will be less expensive than that of the barrage, since it will be enough to have hydraulic lime to mix with the sand, which is found at all points of the Canal. TIMBER.—The timber will come from Anatolia and Caramania. Oak and fir planks will be procured from Trieste. These materials will not cost more than at the barrage; for, though the distance of inland transport is greater, the expense of trans-shipment will be avoided by the construction of a new lock, which will unite the Mahmoudieh Canal, and consequently the Nile, with the sea. IRON.—It will be the same with regard to wrought and cast iron, which will be procured from England and Russia. Now, the barrage of the Nile is 1006 _metres_ in length, with four locks, of which two are double, of 12 _metres_ opening, and two others of 15 _metres_. It is established upon a general platform at 7 _metres_ below the low water, is 46 _metres_ wide, and four _metres_ average thickness, with two lines of jaunting piles, and 1600 _metres_ of quay walls, and only cost 18,000,000 _francs_, including the purchase of steam machines, to the number of twenty-two, the construction of all works and all the charges of administration, which were considerable. If this amount is divided by the total length of 1006, 17,900 francs will be obtained for the cost of a running _metre_, including all the accessories of locks, quays, machines, and charges of administration. BARRAGE LOCKS.—Adopting this figure, which is too high by a good third for the Maritime Canal, the two barrage locks and the oblique barrage, being altogether 300 metres in length, would cost _fr._ 5,370,000 We say that this figure is much too high; 1st. Because the barrage was made to support a pressure of 4 to 5 _metres_ of water, while those of the Maritime Canal will never have to sustain more than 2,50 _met._ at the _maximum_ height of the water; 2nd. Because the waters of the Nile, rising to 7,50 _met._ above the low water line, it was necessary to elevate the masonry, piles, and arches, to make at the same time a bridge of passage, and to increase the weight of the masonry; 3rd. and lastly, Because it was necessary to defend the banks of the Nile by 1600 metres of quay walls, both at the approaches of the barrage and at the head of the three canals, which is not necessary here.