EFFICIENCY—application of, to department heads, [375]-377.defined, [371].increased, illustrated, [374].in shop operation (article), [370]-379.ELECTRICITY—applied to manufacturing, [190]-192.ENGINE—gas, development of, [353]-356.EXCHANGES—of natural products, [182].EXPORTS—from U. S., [269]-288.FACTORY—acts, [88], [89].described, [31].system. (See System.)town, rise of, [186].FARMS—number and size of, [11].FISHERIES—wasteful use of, [18], [19].FREE TRADERS—arguments of, [162].GOLD—production of, [216], [217].