"That's good news," answered the senator's son. "I always thought that a good meal covered a multitude of sins," and at this misquotation Frank Andrews laughed heartily. The man had already been despatched to get the baggage, and after it arrived Dave and Roger proceeded to make themselves at home, each donning such clothing as they saw the others of the engineering corps wearing. "It's good-bye to boiled shirts and stiff collars," said Roger, "and I'm not sorry for it." "Nor am I," returned Dave. "I'll feel much more like working in this comfortable outfit." Almost before they knew it, it was noon, and presently they saw a number of men, some of them quite young, coming in to dinner. Through Frank Andrews they were introduced to all the others, and then placed at one of the tables in the mess hall where a helper of Jeff, the cook, served them with a meal which, if not exactly elegant, was certainly well-cooked and substantial. "I want you two young men to stay around the offices for the rest of this week," announced Mr. Obray to them after the meal. "That will give you a chance to familiarize yourselves with what we are doing in the way of constructions in this vicinity. Then next week you can go out with the gang and begin your regular field practice." The youths soon found that practical work in the office was quite different from the theoretical work done under Mr. Ramsdell. Still their tutor had instructed them faithfully, so that they soon "caught on," as Roger remarked. When they did not understand a thing they did not hesitate to ask questions, and they found the other persons present very willing to explain and to help them. There was a spirit of comradeship throughout the whole camp that was as comforting as it was beneficial. "It isn't everybody for himself here," explained Frank Andrews. "It is one for all. You are expected to do all you can for the other fellow, and in return it's understood that he will do all he can for you." "It's a fine method," answered Dave; "and I don't wonder that the Mentor Construction Company is making such a success of its undertakings." One day our hero asked Frank Andrews if he knew William Jarvey. At the question the man drew down the corners of his mouth and shook his head in disgust. "Yes, I know Bill," he answered. "He's over in the offices at San Antonio mostly, but he occasionally comes out here on business for Mr. Watson. I must say I don't like him very much, and I don't think the other men do either. He's a fellow who likes to drink now and then, and I understand he often gambles. That is, when he has the money. He's usually strapped long before pay-day comes around." "I thought he might be that sort of fellow," answered Dave. "He got into a row with Mr. Watson while we were at San Antonio," put in Roger, and related a few of the particulars.