George was not content with simply obtaining an idea about plows; he wished to know all that he could about them. He obtained books that gave complete accounts of the varieties of plows, the ways in which they were used, and the work which they should do. He learned that a plow should be fitted to its task. It should be as light as possible, easily drawn, and it should run with even steadiness, at a uniform depth. It should not only turn the soil over, but should thoroughly powder it and bury the weeds. To his great surprise George also learned that some of the modern plows were as much superior to the ordinary plow as that was to the spade. The sulky plow is easier for the horses than the common plow; it makes furrows of different depths; and it has a seat for the farmer. Sometimes several plowshares are placed side by side and drawn by a large number of horses. This is called a gang plow. Steam and wind and water and even electricity are coming into use to furnish power for plows, in place of the animal power of horses. "Well, Uncle Ben," said George one evening, "now I understand something about plowing and tillage. The next thing a farmer does in the spring is to plant his potatoes and corn, is it not?" "Yes," was the reply. "Well, then," said George, "that will not take me long to learn. All there is to do is to dig a hole, put in the potato, and cover it with earth." "I am afraid that you will find that the job is not quite so simple as that. Has the farmer nothing to plant but potatoes?" asked the uncle. "Yes," said the boy. "Corn and turnips and oats and wheat and pumpkins and lots of other things." "Would you plant a kernel of corn in just the same way that you would a potato?" "No, I suppose not," was the reply. "And do you think that every farmer does all his planting by hand? Does he not have tools to help him?" Thus George was started on a new line of thought. He read of the sower, as he slowly walks the length of the field, throwing the grain right and left. Even this work is better and more quickly done by machinery. The hand sower is a little machine which the farmer straps to his shoulders. The hopper of the sower is filled with grain and, as the handle is turned, the grain is scattered broadcast to as great a distance as possible. More saving of labor still is the horse sower, which is simply the hand sower on a larger scale. Sometimes the seed is inserted in the ground by means of grain drills, which deposit the grain more evenly and at the same time cover it with earth.