"True," said Mr. George, "and that is a very important difference, I acknowledge. I don't think my comparison holds good." Mr. George was always very candid in all his arguing. It is of very great importance that all persons should be so, especially when reasoning with boys. It teaches _them_ to be candid. Just at this time Waldron's attention was attracted by the appearance of a very large steamer, which now came suddenly into view, with its great red funnel pouring out immense volumes of black smoke. Waldron ran over to the other side of the deck to see it. Rollo followed, and thus the explanation which Mr. George might have given, in respect to the arithmetical nature and relations of nothing were necessarily postponed to some future time. * * * * * About half an hour after this, while Rollo was sitting by the side of his uncle, looking at the map, and trying to find out how soon they should come in sight of the famous old Castle of Dunbarton, which stands on a rocky hill upon the banks of the Clyde, Mr. Kennedy came up to him to inquire if he knew where Waldron was. Rollo said that he did not know. He had not seen him for some time. "We can't find him any where," said Mr. Kennedy. "We have looked all over the ship. His mother is half crazy. She thinks he has fallen overboard." So Rollo and Mr. George both rose immediately and went off to see if they could find Waldron. They went in various directions, inquiring of every body they met if they had seen such a boy. Several people had seen him half an hour before, when he was with Rollo; but no one knew where he had been since. At last, in about ten minutes, Rollo came running to Mrs. Kennedy, who was walking about through the cabins in great distress, and said, hurriedly, "I've found him; he is safe," and then ran off to tell Mr. Kennedy. Mrs. Kennedy followed him, calling out eagerly, "Where is he? Where is he?" Rollo met Mr. Kennedy at the head of the cabin stairs, and he seemed very much rejoiced to learn that Waldron was found. Rollo led the way, and Mr. and Mrs. Kennedy followed him, until they came to a place on the deck, pretty well forward, where there was an opening surrounded by an iron railing, through which you could look down into the hold below. It was very far down that you could look, and at different distances on the way were to be seen iron ladders going from deck to deck, and ponderous shafts, moving continually, with great clangor and din, while at the bottom were seen the mouths of several great glowing furnaces, with men at work shovelling coal into them. "There he is," said Rollo, pointing down. Mr. and Mrs. Kennedy leaned over the railing and looked down, and there they beheld Waldron, hard at work shovelling coal into the mouth of a furnace, with a shovel which he had borrowed of one of the men. In a word, Waldron had turned stoker.