"Well," Herold replied, "Mr. Rivers seemed to feel that you were keen for it, and figured that if it were given you, you would strain every nerve to make good. But, you see, you will have to do your utmost to justify the stand that Mr. Rivers and myself have taken." "It won't be for want of trying, Mr. Herold," answered Roger, his eyes shining. "I am sure of that, my boy," said the older man kindly, "and that's what we are depending on. Now, let me see, this is the second of December, isn't it? Rivers sails from Seattle on February 15th, so that you had better reckon on being there about the 12th. Suppose then, you go home now for the holidays, take just a month, and report in Washington here on January 2nd, a month from to-day. Then we'll give you a few weeks' work here to learn something about headquarters, and then you can go right on to the Pacific Coast, perhaps spending a day or two at home before starting on the expedition." Roger thanked him heartily, as much for his thoughtfulness about the vacation as for the appointment he had desired so long. Indeed his month at home, amid an air in which he was a sort of hero, passed rapidly, and as the idol of all the boys in the neighborhood, he had to spin yarns by the score, these tales being given reality by the dozens of photographs he had taken on the various parties of which he had been a member. Some of the photos were his own, but others were prints of negatives taken by the assistant topographers usually, for nearly every party in the field has some member whose skill makes him almost an official photographer. Indeed, nearly every one on the Survey is a master of photography, and few outfits do not contain at least one excellent camera. On his return to Washington in January, however, Roger found it somewhat tedious to settle to indoor office work, but his interest grew in finding that the department had in operation scores of other lines of work that had not occurred to him. His surprise in the field at constantly encountering new avenues of work became amazement in Washington, when he first really gained an idea of the extent of the department's scope. On the question of maps alone, he learned how important the Survey is to the country. Maps which should show a mining company in which direction ore-bearing veins should run, maps which should inform a railroad as to the comparative elevations along a proposed right of way, maps which should teach a farmer where to sink an artesian well for watering his stock, maps which form the basis of vast irrigation projects, maps which point the builder where to go to quarry stone, maps to form the basis of the special timber charts of the Forestry Service, maps dealing with coal-producing areas, and for a score of other purposes, for all these the Survey is called on.