The Romans not only had great public highways, but they possessed a complete and systematic network of cross-roads, which connected villages, and brought into communication therewith cultivated farms and prosperous homesteads. In Italy alone it is estimated that they had about fourteen thousand miles of good roads. Their laws relating to the construction and maintenance of highways were founded in reason and a just conception of the uses and objects of public ways; and they are the basis of modern highway legislation. By their law the roads were for the public use and convenience, and their emperors, consuls, and other public officials were their conservators. They were built at the public expense, under the supervision of professional engineers and surveyors, and kept in repair by the districts and provinces through which they passed. But during the dark ages, when arts were lost, when popular learning disappeared or found shelter only in cloisters and convents, when commercial intercourse between nations vanished, and when civilization itself lay fallen and inert, these magnificent Roman roads were unused and left to the destructive agencies of time and the elements of Nature. Rains and floods washed away and inundated their embankments; forests and rank vegetation overgrew and concealed them; winds covered them with dust and heaps of sand; and little by little in the process of ages their hard surfaces and massive foundations were somewhat broken and caused to partially decay. That their remains still exist in every part of the world which ever bore up the Roman legions is conclusive evidence that they were built by master workmen who realized that they were responsible to posterity and to the eternal powers. "In the elder days of Art Builders wrought with greatest care Each minute and unseen part; For the gods see everywhere." In China, at one time, labor was so abundant that it was kept employed in constructing great walls and ponderous roads. The road-bed was raised several feet above the level of the ground by an accumulation of great stones, and then covered with huge granite blocks. It was found that in time the wheels of vehicles wore deep ruts in the stones, while the travelled part of the road became so smooth that it was almost impossible for animals to stand thereon.