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 it will hold true, visibly and securely, only as applies to the leading mechanical industries, those main lines of industry that shape the main conditions of life, and in which quantity production has become the common and indispensable rule. Such are, e.g., transport and communication; the production and industrial use of coal, oil, electricity and water power; the production of steel and other metals; of wood pulp, lumber, cement and other building materials; of textiles and rubber; as also grain-milling and much of the grain-growing, together with meat-packing and a good share of the stock-raising industry.

There is, of course, a large volume of industry in many lines which has not, or only in part and doubtfully, been drawn into this network of mechanical processes and quantity production, in any direct and conclusive fashion. But these other lines of industry that still stand over on another and older plan of operation are, after all, outliers and subsidiaries of the mechanically organized industrial system, dependent on or subservient to those greater underlying industries which make up the working body of the system, and which therefore set the pace for the rest. And in the main, therefore, and as regards these greater mechanical industries on whose due work-