The canal was not finished during the reign of Necho II. The work was continued by his successors, and finally completed, but it was neglected, and the drifting sands soon filled the canal and made it useless. It remained so for centuries, though several attempts were made to clear it out. It is said to have been re-opened about the year 1000 of our era, by one of the Arab sultans, but it was again neglected, with the same result as before. [Sidenote: PLAN OF NAPOLEON FOR DIGGING A CANAL.] In modern times, the first to take up the subject and give it careful attention, was the emperor Napoleon, at the time of his conquest of Egypt in 1798. He personally examined the traces of the canal made by Necho and his successors, and ordered one of his engineers to make a careful survey of the route, to ascertain what difference there might be between the levels of the two seas. This engineer reported a difference of thirty feet, and as this would render it impossible to make a direct canal without locks, a scheme was projected for making use of a portion of the Nile, as in the olden time, and having a system of locks where the salt-water canal joined the river. But the chances of war interfered, as the French were compelled to evacuate Egypt before the plan had been reported. Nothing more was done until 1846, when a mixed commission was appointed to investigate the matter. They exploded the old error of a difference of level, and showed that the height of the water on each side was so nearly the same as to make no appreciable difference. Further than to establish this fact, the commission did not go, except to draw up some elaborate plans, which never amounted to anything. [Sidenote: HOW THE CANAL WAS PLANNED AND DUG.] In 1855, a project was completed by M. de Lesseps, for a canal without locks, and this is the scheme which has been successfully carried out by the Suez Canal Company. Some of the details were changed, but none of them are of any serious consequence. It would require too much space to record all the diplomatic and other negotiations that attended the inception of the scheme, and the various means adopted to secure the funds necessary for conducting the work. The financial part of it was quite as difficult as the labor of the engineers, and several times it looked as though the enterprise must be abandoned altogether. The whole capital required by the canal, from commencement to completion, was about seventeen million pounds sterling, or eighty-five millions of dollars!