Handing the lines over to the banker, Bob hurried after the agent, who was racing down the field so as to catch up to the tractor before it reached the corner. Then he stopped the machine until Bob came up. "Now, this is how it's done, Bob. You see this self-steering device down here in the furrow. Well, I set this lever and clamp it over fast and this self-steering device rubs along the edge of the furrow and keeps the plow following the furrow. In big fields in the West, where there's plenty of room and the ground is comparatively level, we always plow around a circle. There's where we use our big fellers," he said smiling. "Fourteen plows in a gang and one man can operate all of them at once." "You don't mean it," said Bob. "Three or four plows going at once, and each one plowing fourteen furrows. Why, you would plow a field like this in less than a day." "Less than a day," said the agent. "How long will it take you to finish this field with your team, Bob?" [Illustration with caption: THE TRACTOR WILL DO THE WORK OF FIVE MEN AND FIVE TEAMS AND ONLY EATS WHEN IT'S WORKING] "Well, I expect to get through by noon on Saturday," he replied. "Well, what do you say if we finish it up by six o'clock tonight?" "But you couldn't do that, Mr. Patterson!" "We can't! Well, you just wait till I show you. I want you to get into the seat and run it yourself, Bob; then you can see how it goes." The boy climbed awkwardly into the machine and adjusted the levers according to instructions. "I'm sure I won't be able to handle it, Mr. Patterson," he said, as he opened the throttle and the engine started. "Won't be able to handle it? All you need to do is to sit on the seat and let it go. Now shove this lever and throw in the clutch," suggested the agent, and off the plow started. "It does run easy," said Bob, as the tractor moved rapidly ahead, the agent walking alongside, talking to Bob as they went. "Easy!" remarked the agent. "Why, you can run this machine all day, Bob, and it won't make you as tired in a whole day as doing your chores. Now, when you get to the corner put your throttle down and I'll show you how to make the turn." Bob was a bit awkward, but finally made the adjustment and got the plow to a standstill at the corner. "You see, Bob," said Mr. Patterson, "when you use a gang plow you don't cut the corners square as you do with a team of horses. You round them off a bit, then you don't need to take the trouble to turn. Now, while you plow around, I'll take your team and plow off the corners." "You aren't going to let me go around myself, Mr. Patterson?" asked Bob. "Certainly, you can run it yourself just as well as anybody," replied the agent. "After I finish with the team, Mr. White and I have some business to do. By the way, can we use your telephone, Bob?"