Process.--When common salt is prepared from sea-water by evaporation and crystallization, a liquid remains which goes under the name of _bittern_. This liquid on passing chlorine through it, is tinged with a deep yellow color. The liquid is now distilled, and the vapor passed over a substance, (muriate of lime), which has a powerful attraction for water. A small quantity of bromine is thus obtained.--Another method is to agitate the chlorinated bittern with a portion of sulphuric ether. The ether dissolves the bromine, from which it receives a beautiful red tint, and on standing, rises to the surface. Agitate this solution with caustic potash, and the bromide of potassium and bromate of potassa will be formed. Evaporate the liquor and the bromide of potassium will be left from which bromine may be distilled. Properties.--At common temperatures, it rapidly volatilizes, giving red vapors of a most disagreeable smell. Its color, when held between the eye and the light is a deep hyacinth red. Like oxygen, chlorine, and iodine, it is a non-conductor of electricity, and a negative electric. It boils at 116·5°, and congeals at 40 Fahr. into a brittle solid. It is a powerful poison; even its vapor would no doubt prove fatal, if inhaled in large quantities. A single drop placed in the beak of a bird destroys it instantly. Operators cannot be too cautious in using it. A very small drop spattered in the eye would destroy the sight. Bromine is very corrosive. A lighted taper burns for a few moments in its vapor, with a flame green at its base, and red at the top, and is then extinguished. It is soluble in water, alcohol, and ether; the latter is the best solvent. With water at 32° Fahr., if forms a _hydrate_, in crystals of a fine red color. It gives to a solution of starch an orange color. Chlorine will displace it from all its combinations with hydrogen. Chloride of Bromine.--Formed by transmitting a current of chlorine through bromine, and condensing the disengaged vapors by a freezing mixture. The factitious article is more simply formed, and is equally good as an accelerator, but not as quick. See page 25, Part I. M. Bissou, a Frenchman, found that the real chloride of bromine is so sensitive, that Daguerreotype proofs are taken by it in half a second. He succeeded in taking persons and animals in the act of walking. Bromic Acid may be obtained by pouring sulphuric acid upon a dilute solution of bromide of baryta, and evaporating. No interest. Bromide of Baryta.--Boil of protobromide of iron with moist carbonate of baryta; carefully evaporate and it will crystallize in white rhombic prisms, which have a bitter taste, are slightly deliquescent, and soluble in water and alcohol.