When he came of age he had inherited a couple of thousand pounds, which had been left in trust to him by his father. Had it not been for that two thousand pounds he would have been forced to employ his knowledge and his talents conventionally, and would probably have made a fortune. But it was just enough to relieve him from the necessity of earning his living for the time being, and to make it possible for him to devote himself entirely to the realisation of his life-dream--at any rate until the money was gone. Of course he yielded to the temptation--nay, he never gave the other course a moment's thought. Two thousand pounds would last him for years; and no one could have persuaded him that with complete leisure, freedom from all other concerns, and money for the necessary experiments, he would not have succeeded long before his capital was exhausted. So he put the money into a bank whence he could draw it out as he chose, and withdrew himself from the world to work out the ideal of his life. Year after year passed, and still success did not come. He found practice very different from theory, and in a hundred details he met with difficulties he had never seen on paper. Meanwhile his money melted away in costly experiments which only raised hopes that ended in bitter disappointment. His wonderful machine was a miracle of ingenuity, and was mechanically perfect in every detail save one--it would do no practical work. Like every other inventor who had grappled with the problem, he had found himself constantly faced with that fatal ratio of weight to power. No engine that he could devise would do more than lift itself and the machine. Again and again he had made a toy that would fly, as others had done before him, but a machine that would navigate the air as a steamer or an electric vessel navigated the waters, carrying cargo and passengers, was still an impossibility while that terrible problem of weight and power remained unsolved. In order to eke out his money to the uttermost, he had clothed and lodged himself meanly, and had denied himself everything but the barest necessaries of life. Thus he had prolonged the struggle for over five years of toil and privation and hope deferred, and now, when his last sovereign had been changed and nearly spent, success--real, tangible, practical success--had come to him, and the discovery that was to be to the twentieth century what the steam-engine had been to the nineteenth was accomplished. He had discovered the true motive power at last.