1. Maize Maize Maize Maize Maize 2. Oats Maize Maize Maize Barley 3. Wheat Oats Oats Wheat Alfalfa 4. Clover and Wheat Clover and Clover and Alfalfa timothy timothy timothy 5. Timothy Clover and Timothy Timothy Alfalfa timothy 6. Timothy Timothy Timothy Timothy Alfalfa During the first year the 20-acre field could be divided into four tracts of five acres each, containing potatoes, cabbage, tomatoes and sweet corn, and then followed for four or five years by any succession of crops above outlined. The point is that a definite adjustment of the farm to some general method of rotation and a definite system of fertilization and soil renovation do not prevent a considerable latitude in the crops raised. It will be obvious that the longer the rotation the more flexible it becomes in this particular, which is a point to be considered in laying out the farm and in adjusting fields and fences. In some cases it may be desirable on account of the arrangement of the farm or the character of the crops to be raised to have two distinct rotations of crops. For example, if the farm lends itself to be divided into eight tracts, a five-course rotation of maize, oats, wheat, each one year, and clover and timothy two years, and a three-course rotation of potatoes, oats or wheat and clover may be arranged. CHAPTER X THE EQUIPMENT The workman is known by his tools. The problem of obtaining the most efficient machinery for the conduct of the farm without having an excessive amount is not easy of solution. It is probable that the cost of maintaining machinery and tools is not less than 15%, 10% for upkeep and 5% for interest, even under the most careful management. Doubtless in practice it is as much as 25%. If this is conceded there must be a limit to the amount which may be economically invested in equipment. This is a place where the lead pencil may be used profitably. For example, if $125 is invested in a self-binder, the annual cost of the machine at 15% will be $18.75. If one has but 15 acres of grain to harvest, it may be better to hire a self-binder at $1 an acre. On the other hand, it may be necessary to own a self-binder in order to get the grain harvested at the proper time.