Three memoirs on different parts of the course, other than the geological, will be made immediately after the interrogations relative to each section. Particular data will be furnished to each Sub-Lieutenant. Three attendances in the halls of study will be allowed for these memoirs. _Fourth.--Geological Excursions._ Three geological excursions will be made in the environs of Metz by groups of ten or twelve Sub-Lieutenants under the direction of the Professor, and at the period of the out-of-door work, so as not to interfere with the current work in the halls. The first excursion will have for its object the study of the lias and lower oolite, met with in the vicinity of Metz. If the time will admit of it, a reconnaissance will be made to the great oolite at Taumont or at Amanvillers. The second excursion will be made in the direction of Gorze for the study of the lower oolitic formation and to trace it up to Bradford clay, where an important fault occurs in this direction near to Metz. The study of this fault will be the great object of this excursion. The third excursion will be made in the direction of Forbach, meeting with the lias, chalk-colored freestone, &c. Three entire days will be devoted to these excursions, and each Sub-Lieutenant will enter his observations in a note-book, and make a certain number of sections, and report the results of these excursions in three memoirs in a specified time. _Fifth.--Manipulations relative to Moulding in Earth or Sand._ These mouldings of projectiles will be made by sections of ten or twelve Sub-Lieutenants, two attendances of three hours each being devoted to them, one for ordinary and the other for hollow projectiles. The manipulations for the moulding of cannon will be executed by the Professor. All the Sub-Lieutenants will be successively called by sections a certain number of times, in order that they may be enabled to render an account of the different states of advancement of the work. Programme of practical instruction for the casting of projectiles. 1st attendance. Making shot, &c. 2d attendance. Making hollow projectiles. Programme of the moulds to be executed by the Professor. Manufacture of cannon; moulding in earth and the various processes to be carried on. _Sixth.--Chemical Manipulations._ The chemical manipulations are made by sections of ten or twelve Sub-Lieutenants. Nine attendances of three hours each are employed. 1st. To the determination of the specific gravity and real density of gunpowder and to its analysis. 2d. To two other analyses of gun-metal, iron-ore, &c. _Seventh.--Manipulations in Pyrotechny._