The Trade Union Movement was not absolutely left for dead when Owen quitted the field. The skilled mechanics of the printing and engineering trades had, as we shall presently see, held aloof from the general movement, and their trade clubs were unaffected either by the Owenite boom or its subsequent collapse. In some other trades the inflation of 1830-4 spread itself over a few more years. The Potters’ Union went on increasing in strength, and in 1835 gained a notable victory over the employers, when a “Green Book of Prices” was agreed to, which long remained famous in the trade. Renewed demands led to the formation by the employers of a Chamber of Commerce to resist the men’s aggression. The “yearly bond” was rigidly insisted upon, and a great strike ensued, which ended in 1837 in the complete collapse of the Union.[292] In 1836 the Scottish compositors formed the General Typographical Association of Scotland, which for a few years exercised an effective control over the trade. The same year saw a notable strike by the Preston Cotton-spinners, from which is dated the general adoption of the self-acting mule.[293] But the most permanent effect is seen in the building trades. The national Unions of Plumbers and Carpenters have preserved an unbroken existence down to the present day,[294] whilst the Friendly Society of Operative Stonemasons remained for nearly another half century one of the most powerful of English Unions. The fortnightly circulars of the English Stonemasons reveal, for a few years, not only a vigorous life and quick growth, but also many successful short strikes to secure Working Rules and to maintain Time Wages. The Scottish Stonemasons are referred to as being even more active and influential in trade regulation, and as having included practically all the Scottish masons. There is evidence, too, of informal federal action between the National Unions of Stonemasons, Carpenters, and Bricklayers. Unfortunately the absence of such modern machinery of organisation as Trades Councils, Trade Union Congresses, and standing joint committees prevented the scattered sectional organisations from forming any general movement. This state of things was broken into during the year 1837 by the sensational strikes in Glasgow, the prolonged legal prosecution and severe punishment of their leaders, and the appointment of a Parliamentary Committee of Inquiry into the results of the repeal of the Combination Laws.