unions also furnish all the most influential leaders of opinion among the working classes. *82. Federation of Trade Unions.*--From the earliest days of trade-union organization there have been efforts to extend the unions beyond the boundaries of the single occupation or the single locality. The earliest form of union was a body made up of the workmen of some one industry in some one locality, as the gold beaters of London, or the cutlers of Sheffield, or the cotton spinners of Manchester. Three forms of extension or federation soon took place: first, the formation of national societies composed of men of the same trade through the whole country; secondly, the formation of "trades councils,"--bodies representing all the different trades in any one locality; and, thirdly, the formation of a great national organization of workingmen or trade unionists. The first of these forms of extension dates from the earliest years of the century, though such bodies had often only a transitory existence. The Manchester cotton spinners took the initiative in organizing a national body in that industry in 1829; in 1831 a National Potters' Union is heard of, and others in the same decade. The largest and most permanent national bodies, however, such as the compositors, the flint-glass makers, miners, and others were formed after 1840; the miners in 1844 numbering 70,000 voting members. Several of these national bodies were formed by an amalgamation of a number of different but more or less closely allied trades. The most conspicuous example of this was the Amalgamated Society of Engineers, the formation of which was completed in 1850, and which, beginning in that year with 5000 members, had more than doubled them in the next five years, doubled them again by 1860, and since then has kept up a steady increase in numbers and strength, having 67,928 members in 1890. The increasing ease of travel and cheapness of postage, and the improved education and intelligence of the workingmen, made the formation of national societies more practicable, and since the middle of the century most of the important societies have become national bodies made up of local branches.