_Lecture_ 30.--Last operations. Proofs and reception of cannon. Chemical operations. Assay and analysis of the metals employed in the casting of gun-metal; proportion of the several ingredients. SIXTH PART.--ON THE MANUFACTURE OF POWDER. _Lecture_ 31.--General notions. Various kinds of powder, &c. On saltpetre and sulphur. _Lecture_ 32.--Charcoal; wood employed; various kinds of charcoal; proceeding followed in making powder in various ways by the pestle. _Lecture_ 33.--Manufacture by mills, &c. _Lecture_ 34.--Influence of the proportion of the several ingredients, and of the manner of making it on its various properties. Preservation, inflammation, and combustion. _Lecture_ 35.--Proofs and reception of powder. Proof of its projectile force. Mortar proof, and various kinds of other proofs to which it is subject. Reception and analysis of powder. SEVENTH PART.--PYROTECHNY. _Lecture_ 36.--Preliminary ideas. Objects of the course. Precautions that should be adopted to prevent accident. Mixture of the materials. Manufacture of leaden balls of various kinds. Caps. Fireworks for warlike purposes, used for setting buildings, &c., on fire. Firing cannon and exploding mines. _Lecture_ 37.--Fireworks employed under various circumstances in war. Signal rockets. For illuminating or setting on fire. For explosions. Petards. On ordinary fireworks. _Works of Application._--The works of application which are connected with the course of science applied to the military arts are as follows:-- 1st. Study of samples of mineralogical specimens. 2d. Study of geological maps to be followed by a memoir. 3d. Memoirs on: 1st. Iron and its applications. 2d. Manufacture of cannon. 3d. Manufacture of small-arms and powder. 4th. Out-of-door geological excursions to be followed by memoirs. 5th. Manipulations relative to moulding in earth or sand. 6th. Chemical manipulations. 7th. Pyrotechnic manipulations. _First.--Study of Samples of Mineralogical Specimens._ This study has for its object the determination of the kind of minerals described in the course. It is made in sections of ten or twelve Sub-Lieutenants and by attendances of one hour, each Sub-Lieutenant being called upon to reply at least three times. _Second.--Study of Geological Maps, followed by a Memoir._ The study of geological maps will consist in indicating, by conventional colors, the different geological formations of a lithographical map, and to make a section in a particular direction. The map will be the same for all, and it will be conceived so as to correspond with the geological formation of France, but the sections will differ for each student. An explanatory memoir will have for its object to call the attention of the Sub-Lieutenants to the most salient facts which will be placed in relief by this study. One attendance in the halls of study will be devoted to this work. _Third.--Three Memoirs._