Scientific amusements . Productioii cf hytlrcjcliloric acid, _ -^ binations with oxygen. Its combination with hydrogenhas already been referred to. Bromine is a rare element. (Symbol Br. Atomicweight 80.) It is deep brownish red, very volatile, and of a peculiarodour. Bromine unites with the elementary bodies, andforms some oxygen compounds. It resembles chlorine-in its properties, and is used in medicine and in photo-graphy. It is found in saline springs and in salt water,combined with soda and magnesium. The presence of lODINK. 95 bromine may easily be detected in tlie strong smell of seawee
Scientific amusements . Productioii cf hytlrcjcliloric acid, _ -^ binations with oxygen. Its combination with hydrogenhas already been referred to. Bromine is a rare element. (Symbol Br. Atomicweight 80.) It is deep brownish red, very volatile, and of a peculiarodour. Bromine unites with the elementary bodies, andforms some oxygen compounds. It resembles chlorine-in its properties, and is used in medicine and in photo-graphy. It is found in saline springs and in salt water,combined with soda and magnesium. The presence of lODINK. 95 bromine may easily be detected in tlie strong smell of seaweed. Its combinations with metals are termed is a powerful poison. Iodine is another relative of chlorine. It is found inseaweed, which by burning is reduced to kelp. Wheniodine is heated a beautiful violet vapour comes off, andthis characteristic has given it its name (iodes, violet).. Apparatus for obtaining dry chlorine gas. Iodine was discovered by Courtojs, of Paris, and in 1813Gay^Lussac made it a special study. It is solid at ordinarytemperatures, and assumes crystallized forms in plates ofmetallic lustre. It is an excellent remedy in goitre andsuch afifections. (Symbol I. Atomic weight 127.) Fluorine is very difficult to prepare. Fluor spar isa compound of fluorine and calcium. This element isgaseous, and combines so rapidly that it is very difficult 96 , CHEMISTRY. to obtain in a free state. Etching on glass is accomplishedby means of hydrofluoric acid, for fluorine has a greataffinity for silicic, acid, which is contained in glass. Theglass is covered with wax, and the design is traced witha needle. The acid attacks the glass and leaves the wax,so the design is eaten in. (Symbol F. Atomic weight 19.) Chlorine, fluorine, bromine, and iodine are termed Halogens (producers of salts). They appear, as wehave seen, in a gaseous, liquid, and solid form respectivel
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Keywords: ., bookcentury1800, bookdecade189, booksubjectscientificrecreations
