The telegraph manual: a complete history and description of the semaphoric, electric and magnetic telegraphs of Europe, Asia, Africa, and America, ancient and modern.

776 PREPARATORY EDUCATION OF CANDIDATES.
irregular winds. 21st. Fog and dew. 22d. Electricity. 23d.
Conductors, non-conductors and power of points. 24th. Electricity by induction. 25th. Electroscope. 26th. Electric Machines. 27th. Electric batteries. 28th. Leyden jar. 29th.
Electrometers. 30th. Thunder. 31st. Lightning rods. 32d.
Return currents. 33d. Magnets. 34th. Poles of magnets.
35th. Process of magnetization. 36th. Armature of magnets.
37th. Magnetic needle. 38th. Magnetic meridian. 39th.
Declination and inclination. 40th. Terrestrial magnetism.
41st. The compass. 42d. Batteries, and of their different
kinds. 43d. Their organization. 44th. Theory of the batteries. 45th. Luminous and calorific and mechanical effects.
46th. Chemical effects of batteries. 47th. Galvanoplastic.
48th. Silvering and gilding. 49th. Decomposition of water
by means of the battery. 50th. Dry batteries. 51st. Electro-magnetism. 52d. Deviation of the magnetic needle by
means of a current of electricity. 53d. Attraction and repulsion of a magnet by means of a current of electricity. 54th.
Galvanometer or multiplier. 55th. Currents produced by ordinary electricity. 56th. Magnetization by means of currents of electricity. 57th. Magnetization of soft iron by
means of a current. 58th. Operation of magnetism in motion.
59th. Thermo-electricity and its theory. 60th. Electrical action of Daniel's and Bunson's batteries. 61st. Conductibility
of metals. 62d. Laws of the intensity of the current in a
homogeneous circuit, and also in a heterogeneous circuit. 63d.
Intensity of currents and the laws of deviation.
V. CHESIISTRY.
1st. Simple bodies. 2d. Compound bodies. 3d. Nomenclatures. 4th. Acids, bases, and salts. 5th. Oxygen. 6th.
Combustion. 7th. Azote. 8th. Atmospheric air. 9th. Hydrogen. 10th. Water. 11th. Carbon. 12th. Carbonic acid.
13th. Carbonized hydrogen. 14th. Gas for lighting. 15th.
Azote gas. 16th. Amonics. 17th. Sulphur. 18th. Sulphuric acid. 19th. Sulphurous acid. 20th. Sulphuretted hydrogen. 21st. Phosphorus. 22d. Phosphoric acid. 23d. Phosphoretted hydrogen. 24th. Chloride. 25th. Chlorhydric acid.
26th. Salts in general. 27th. Laws of Berthollet. 28th. Calcareous earths. 29th. Hydraulic limes. 30th. Mortars and
plasters. 31st. Potash. 32d. Soda. 33d. Sulphate of soda.
34th. Marine salts. 35th. Iron, zinc, tin, copper, and mercury, and their salts. 36th. Sulphate of copper. 37th. Of
silver, gold and platina, and the character of their salts.
38th. Theory of metallurgy. 39th. Theory of mining, etc.