By the Professor of Military Art, 2 1st. Considerations relating to the fortress of Metz. Circumstances which might bring on a siege of it. Force of the garrison and of the besieging army. Investment. 2d. Trace of the lines of circumvallation and of countervallation. By the Professor of Topography, 1 Execution of the second reconnaissance plan (_memoire_,) (1 lecture.) 1st. Measure of the base. Plan of the ground of the attack. Construction of the plans. Plans of the work executed. By the Professor of Permanent Fortification, 2 1st. Discussion on the points of attack. Organization of the _personnel_ and _matériel_ of the Engineers of the besieging army and of the garrison. 2d. General progress of attack, and general dispositions of defense. By the Professor of Artillery, 2 1st. Composition of the personnel and matériel of the Artillery of the besieging army. Transport of the siege equipage. 2d. General dispositions of the artillery in the attack and defense. SECOND SECTION.--COMPOSITION OF THE PERSONNEL. Director of the Siege.--The General Commandant of the School. Chief of the Staff.--The Colonel second in command of the School. Chief of the Artillery Service.--The Major of Artillery attached to the Staff. Director of the Park of Artillery.--This may be given to the preceding. Chief of the Engineer Service.--The Major of the Engineers attached to the Staff of the School. Director of the Engineer Park.--This may be given to the preceding. Major of the Trenches.--A Captain. Chiefs of Attacks. Captains. Chiefs of Brigades.--Named by the General Commandant of the Siege. THIRD SECTION.--CONFERENCES. Before proceeding to the ground, the sub-lieutenants assist at conferences which are held for the purpose of explaining to them the successions of the several operations of the siege, as well as upon the traces which they have to execute. These conferences, eight in number, are divided as follows:-- The Chief of the Artillery Service will hold 4 conferences, and The Chief of the Engineer Service “ 4 “ FOURTH SECTION.--TRACING OF LINES AND TOPOGRAPHICAL WORK. 1st. The second reconnaissance survey (comprised in the course of topography.) Tracing of lines; one day is allowed for this work. 2d. “Director” plan. The execution of this plan comprises out-of-door work and drawing. The out-of-door work includes the measurement of one or many bases, the observation of the angles which are formed by this base, and the direction of certain remarkable points in the city and fortification, and the formation of a net-work of triangulation, intended to co-ordinate the surveys of the details.