The reader who has followed us up to this point will have observed that handicraft labour was the first stage of the development of human power, and that machinery has been its last and highest. The uncivilized man began with a stone for a hammer, and a splinter of flint for a chisel, each stage of his progress being marked by an improvement in his tools. Every machine calculated to save labour or increase production was a substantial addition to his power over the material resources of nature, enabling him to subjugate them more effectually to his wants and uses; and every extension of machinery has served to introduce new classes of the population to the enjoyment of its benefits. In early times the products of skilled industry were for the most part luxuries intended for the few, whereas now the most exquisite tools and engines are employed in producing articles of ordinary consumption for the great mass of the community. Machines with millions of fingers work for millions of purchasers--for the poor as well as the rich; and while the machinery thus used enriches its owners, it no less enriches the public with its products. Much of the progress to which we have adverted has been the result of the skill and industry of our own time. "Indeed," says Mr. Fairbairn, "the mechanical operations of the present day could not have been accomplished at any cost thirty years ago; and what was then considered impossible is now performed with an exactitude that never fails to accomplish the end in view." For this we are mainly indebted to the almost creative power of modern machine-tools, and the facilities which they present for the production and reproduction of other machines. We also owe much to the mechanical agencies employed to drive them. Early inventors yoked wind and water to sails and wheels, and made them work machinery of various kinds; but modern inventors have availed themselves of the far more swift and powerful, yet docile force of steam, which has now laid upon it the heaviest share of the burden of toil, and indeed become the universal drudge. Coal, water, and a little oil, are all that the steam-engine, with its bowels of iron and heart of fire, needs to enable it to go on working night and day, without rest or sleep. Yoked to machinery of almost infinite variety, the results of vast ingenuity and labour, the Steam-engine pumps water, drives spindles, thrashes corn, prints books, hammers iron, ploughs land, saws timber, drives piles, impels ships, works railways, excavates docks; and, in a word, asserts an almost unbounded supremacy over the materials which enter into the daily use of mankind, for clothing, for labour, for defence, for household purposes, for locomotion, for food, or for instruction.