Not only were agriculture and many forms of manufacture conjoined, but the division of labour and differentiation of processes within the several industries was not very far advanced. The primitive tillage of the common-fields which still prevailed in the early eighteenth century, though the rapid enclosure of commons was effecting a considerable, and from the wealth-producing point of view, a very salutary change, did not favour the specialisation of land for pasture or for some particular grain crops. Each little hamlet was engaged in providing crops of hay, wheat, barley, oats, beans, and had to fulfil the other purposes required by a self-subsisting community. This partly arose from the necessity of the system of land tenure, partly from ignorance of how to take advantage of special qualities and positions of soil, and partly from the self-sufficiency improved by difficulties of conveyance. As the century advanced, the enclosure of commons, the increase of large farms, the application of new science and new capital led to a rapid differentiation in the use of land for agricultural purposes. But in the earlier part of the century there was little specialisation of land except in the West Riding and round the chief centres of the woollen trade, and to a less extent in the portions of the counties round London whose position forced them to specialise for some particular market of the metropolis. § 10. As the small agriculturist on a self-sufficing farm must perform many different processes, so the manufacturer was not narrowed down to a single process of manufacture. A large part of the ruder manufactures were home productions for home consumption, and the same hands tended the sheep which furnished the wool, and spun and wove the wool for family use. The smith was in a far fuller sense the maker of the horse-shoe or the nail or bolt than he is to-day; the wheelwright, the carpenter, and other handicraftsmen performed a far larger number of different processes than they do now. Moreover, each household, in addition to its principal employments of agriculture and manufacture, carried on many minor productive occupations, such as baking, brewing, butter-making, dressmaking, washing, which are now for the most part special and independent branches of employment.