Aluminium

a metal which does not occur in nature in the free state, but for the most part in ‘ombination with silica, as a silicate of atumininm,.n clay and many minerals. As extractea from clay vy a series of very difficult chemical operations, it forms a white metal, very ductile and malleable, md susceptible of a high polish. S.G. 2°6, M.P. 700° C., At. Wt. 27. On account of its lightne iluminium is highly valued; it forms excellent alloys. The frameworks of all the “Zeppelin” airships are made of an aluminium alloy. It undoubtedly has a great future.