The predominance of Chartism over Trade Unionism was confined to the bad times of 1837-42. Under the influence of the rapid improvement and comparative prosperity which followed, the Chartist agitation dwindled away; and a marked revival in Trade Unionism took effect in the re-establishment, about 1843, of the Potters’ Union, and of an active Cotton-spinners’ Association, and, in 1845, by the amalgamation of the metropolitan and provincial societies of compositors into the National Typographical Society.[309] The powerful United Flint Glass Makers’ Society (reorganised in 1849 as the Flint Glass Makers’ Friendly Society of Great Britain and Ireland) dates from the same year. Delegate meetings of other trades were held; and national societies of tailors and shoemakers were set on foot. A national conference of curriers in 1845 established a federal union of all the local clubs in the trade. But the most important of the new bodies was the Miners’ Association of Great Britain and Ireland, formed at Wakefield in 1841.[310] Up to this period the miners, held in virtual serfage by the truck system and the custom of yearly hirings, had not got beyond ephemeral strike organisations. Strong county Unions now grew up in Northumberland and Durham on the one hand, and Lancashire and Yorkshire on the other; and the new body was a federation of these. Under the leadership of Martin Jude, it developed an extraordinary propagandist activity, at one time paying no fewer than fifty-three missionary organisers, who visited every coalpit in the kingdom. The delegate meetings at Manchester and Glasgow in the year 1844 soon came to represent practically the whole of the mining districts of Great Britain; and the membership rose, it is said, to at least 100,000.[311]