It is true that McAdam's plans were not adhered to exactly as he first laid them down. Greater experience led later authorities to attach more importance to a foundation than McAdam had been disposed to do; though they did not necessarily have foundations laid by hand, after the manner of Telford's buried pavements. Later, the introduction, also, of the steam-roller was to revolutionise the art of making macadamised roads. Nor can it be disputed that McAdam and Telford had both, to a certain extent, been anticipated. In an article on roads published in the "Quarterly Review," in 1820, the observation is made in respect to them that "Many of the practices of each of these gentlemen had been previously adopted in a variety of instances; but it required zeal and perseverance like theirs to recommend the entire system to the attention of the public." Other persons might have recommended the use of broken stones, and these are said to have been already employed in Switzerland before McAdam came on the scene; but it was his lucid explanation of the scientific bearing of angular as opposed to round stones; his untiring zeal in travelling thousands of miles over English and Scottish roads in order to see and study everything for himself; and his advocacy of scientific road-making with such indefatigable energy, though {107}to his own impoverishment (until Parliament voted him recompense), that led to the conspicuous and world-wide success his system eventually attained. Writing in 1826, "Nimrod" said: "Roads may be called the veins and arteries of a country, through which channels every improvement circulates. I really consider Mr McAdam as being, next to Dr Jenner, the greatest contributor to the welfare of mankind that this country has ever produced." This may seem, to-day, to be exaggerated praise; but if the reader looks at the matter from the point of view from which "Nimrod" himself must have regarded it, and tries to realise how greatly the deplorable state of the roads--before McAdam began to repair them--was hampering social life, travel, trade, commerce and national industries, he will probably conclude that such praise, at such a period, and in such circumstances, was far from being undeserved. The turnpike system lasted well into the railway period, and the story of its gradual decline and the causes that led thereto has still to be told. Before, however, dealing further with these aspects of the general question I propose to revert to the subject of rivers and river navigation; to show, next, how canals and canal transport were developed; and then to give an account of the rise of that railway system which was so materially to affect alike rivers, canals and turnpike roads as well. {108}CHAPTER XIII RIVERS AND RIVER TRANSPORT