Notwithstanding these reasons, we have adopted the above figure, in order to obtain a result, rather in excess than below the reality, and thus to give every confidence in our valuations. JETTIES AT PELUSIUM AND SUEZ.—For the jetties, both at Pelusium and Suez, we have said that we should adopt the mode of construction by loose stones, as has been done in the greatest known works, and in the majority of the ports in the Mediterranean, such as Cannes, Bandol, Barcelona, Valencia, Cadiz, Genoa, &c. &c., always reducing the width of the causeway according to the necessity of the case. Thus, the jetty which is to windward in the prevailing winds, has a width of 8 _metres_ at the summit for its causeway, which is at 1 _met._, 50, above low water. There is, moreover, a parapet 4 _met._ thick and 3 _met._, 50, high. On the other hand, the jetty to the leeward has a causeway only 6 _metres_ wide, and the parapet 3 _met._ thick and 2 _met._, 50, high. In order to enable the ships to approach the windward jetty, and to be towed its whole length, masonry in hydraulic mortar has been disposed on the interior slope of the jetty from a depth of 3 _met._ below low water, as shown on the section drawn on the map. This is only in imitation of what is seen in the harbour of Bastia, as well as in those of Cannes and Bandol, and the other details have been taken from those adopted in the construction of the last-mentioned. Assuming that the jetty east of Suez will be 4000 _met._ long, there will be 970,000 _met. cub._ of rough stones, which at 5 _fr._ the _metre_ on board the vessels, amounts to _fr._ 4,750,000 Taking the transport and sinking at 2 _fr._, which is a great deal, we have 1,940,000 --------- Total _fr._ 6,690,000 --------- Say in round numbers 7,000,000 For the western jetty, the same amount 7,000,000 For the jetty west of Pelusium, if we assume that the transport will be for a distance of 150 _kil._ at 0 _fr._ 03 _per ton_, _per kil._ which will be about 0 _fr._ 06 _per cubic metre_, we shall have 9 _fr._ for the cost of transport, to which add 1 _fr._ for sinking; with the cost of extraction it will be 15 _fr._ per _cubic metre_. The quantity being 1,000,000 _met. cub._ we get an amount of 15,000,000 and as much for the western jetty 15,000,000 MOLE OF PELUSIUM.—The defensive mole being 500 _met._ in length, its contents will be 250,000 _met. cub._, and the cost of its construction 3,750,000