This tendency not merely to multiply processes in the manufacture of a single commodity, but to increase the variety of commodities turned out by analogous processes in a single business, is also operative in certain textile and metal industries, where an increasing proportion of the expensive machinery and skilled labour is engaged, not in narrowly specific processes of manufacture, but in generating power and in transmitting it for a number of later uses to be governed by specific machinery. There is in many factories an increasing facility to take on new processes, and to transfer a large portion of the plant from the manufacture of one class of goods to another class. "Most of the operatives in a watch factory would find machines very similar to those with which they were familiar if they strayed into a gun-making factory or sewing-machine factory, or a factory for making textile machinery. A watch factory, with those who worked in it, could be converted without any overwhelming loss into a sewing-machine factory."[110] Thus in the evolution of the modern business we see not only a number of processes in the production of a commodity, each of which constituted a separate business-unit in the earlier division of labour, growing together into a large complex whole, but a growing together of analogous processes in the production of different commodities, a lateral aggregation of processes. So we recognise that the growing complexity of the business-unit, whether we regard it from the point of view of capital or of labour, arises in large measure from an increased integration of productive processes. The business-unit is larger, more heterogeneous, and more highly integrated.