Such was the growth of the railroad, which, it will be observed, originated in necessity, and was modified according to experience; progress in this, as in all departments of mechanics, having been effected by the exertions of many men; one generation entering upon the labors of that which preceded it, and carrying them onward to farther stages of improvement. The invention of the locomotive was in like manner made by successive steps. It was not the invention of one man, but of a succession of men, each working at the proper hour, and according to the needs of that hour; one inventor interpreting only the first word of the problem which his successors were to solve after long and laborious efforts and experiments. "The locomotive is not the invention of one man," said Robert Stephenson at Newcastle, "but of a nation of mechanical engineers." Down to the end of last century, and indeed down almost to our own time, the only power used in haulage was that of the horse. Along the common roads of the country the poor horses were "tearing their hearts out" in dragging cumbersome vehicles behind them, and the transport of merchandise continued to be slow, dear, and in all respects unsatisfactory. Many expedients were suggested with the view of getting rid of the horse. The power of wind was one of the first expedients proposed. It was cheap, though by no means regular. It impelled ships by sea; why should it not be used to impel carriages by land? The first sailing-coach was invented by one Simon Stevinius, or Stevins, a Fleming, toward the end of the sixteenth century. Pierre Gassendi gives an account of its performances as follows: "Purposing to visit Grotius, Peireskius went to Scheveling that he might satisfy himself of the carriage and swiftness of a coach a few years before invented, and made with that artifice that with expanded sails it would fly upon the shore as a ship upon the sea. He had formerly heard that Count Maurice, a little after his victory at Nieuport [1600], had put himself thereinto, together with Francis Mendoza, his prisoner, on purpose to make trial thereof, and that, within two hours, they arrived at Putten, which is distant from Scheveling fourteen leagues, or two-and-forty miles. He had, therefore, a mind to make the experiment himself, and he would often tell us with what admiration he was seized when he was carried with a quick wind and yet perceived it not, the coach's motion being equally quick."[7] The sailing-coach, however, was only a curiosity. As a practicable machine, it proved worthless, for the wind could not be depended upon for land locomotion. The coach could not tack as the ship did. Sometimes the wind did not blow at all, while at other times it blew a hurricane. After being used for some time as a toy, the sailing-coach was given up as impracticable, and the project speedily dropped out of sight.