Nathan was quite as happy. Richard was his sun-god. When the light of hope and success flashed in the inventor's quiet, thoughtful face, Nathan basked in its warmth and was radiant in its glow. He needed all the warmth he could get, poor old man. The cold chill of the days of fear and pain and sorrow had well-nigh shrivelled him up; he showed it in every line of his body. His shoulders were much more bent; his timid, pipe-stem legs the more shaky; the furrows about his face deeper; the thin nose more transparent. All during the war he had literally lived in Richard. The cry of the "extras" and the dull tramp of marching troops, and the rumbling of cars laden with army supplies had jarred on his sensitive ear as would discordant notes in a quartette. Days at a time he would hide himself away in Richard's workshop, helping him with his bellows or glue-pot, or piling the coals on the fire of his forge. The war, while it lasted, paralyzed some men to inaction--Nathan was one of them. "At last, Oliver, at last!" Nathan whispered to Oliver when Richard's head was turned for a moment. "Nothing now but plain sailing. Ah! it's a great day for dear Richard! I couldn't sleep last night on the train for thinking of him." As Oliver looked down into Nathan's eyes, glistening with hope and happiness, he wondered whether, after all these long years of waiting, his father's genius was really to be rewarded? Was it the same old story of success--one so often ending in defeat and gloom, he thought, or had the problem really been solved? He knew that the machine had stood its initial test and had developed a certain lifting power; his father's word assured him of that; but would it continue to develop in proportion to its size? He turned again toward Richard. The dear face was a-light with a new certainty; the eyes brilliant, the smiles about the lips coming and going like summer clouds across the sun. Such enthusiasm was not to be resisted. A fresh hope rose in the son's heart. Could this now almost assured success of his father's help him with Madge? Would their long waiting come any nearer to being ended? Would the sum of money realized be large enough to pay off the dreaded mortgage, and there still be enough for the dear home and its inmates? He knew how large this hoped-for sum must be, and how closely his own and his mother's honor were involved in its cancellation. Her letter had indeed stated the facts--this motor was now their only hope outside the work of his own brush. Perhaps, after all, his lucky day had come. The first gleam of light had been this order of Peter Fish's to paint his daughter, and now here, sitting beside him, was his father with a letter in his pocket addressed to Amos Cobb from one of the richest men in New York, who stood ready to pay a small fortune for the motor. Then he thought of his mother. What a delight it would be when she could be freed from the millstone that had hung around her neck for years.