"The country and the period that witnessed the extraordinary growth of the cotton manufacture, the birth of the and the organization of the , witnessed also a parallel development in the iron industry. This simultaneous progress is a most interesting fact, for the two industries concerned are totally different. They have nothing in common either in their material or their essential processes; and their technical advancement had therefore to proceed by quite different methods. Only deep-lying causes could make them participate in one general evolution. Moreover, the changes in the textile and the metal-working industries are... mutually complementary, like the different parts of an organized body. The beginning of machine industry belong to the history of the textile trades, but its final triumph throughout the world was made possible only by the development of the metal industries."