out of ten a farm roller is a damage to the crop it is intended to benefit because of the manner in which it is used. It is the abuse, not the proper use of a roller, that injures the crop. [Illustration: Figure 141.--Iron Land Roller Made of Boiler Plate.] [Illustration: Figure 142.--Wooden Land Roller.] CORN-PLANTER Corn-planters are designed to plant two rows at once. The width of rows may be adjusted from about 32 to 44 inches apart. When seed-corn is carefully graded to size the dropping mechanism will feed out the grains of corn regularly with very few skips. This is one reason why most farmers plant corn in drills. There are other cultural reasons which do not properly belong to this mechanical article. Hill dropping is considerably more complicated and difficult. After the feeding mechanism has been adjusted to the size of seed kernels to be planted so it will drop four kernels in a hill then the trip chain is tried out to see if it is right at every joint. Dropping in hills is a very careful mechanical proposition. An inch or two out of line either way means a loss of corn in cultivating. In setting the stakes to go and come by, a careful measurement of the field is necessary in order to get the stake lines on both sides of the field parallel. If the ring stakes are driven accurately on the line, then the first hill of corn must come at the same distance from the line in each row. Likewise in starting back from the far side of the field the first hill should measure exactly the same distance from the stake line as the first hills on the opposite side of the field. This is easily managed by counting the number of trips between the stake line and the first row of corn hills. If the two lines of stakes on the opposite sides of the field are exactly parallel it is not necessary to move either line in order to get the proper distance to start dropping, but it must be adjusted by measurement, otherwise the corn hills will be dodged. If the corn hills are to space three feet apart then the first row of hills should come nine or twelve feet from the stake line. Stakes may be measured and set a certain number of inches from the line to make the distance come right. This careful adjustment brings the hills in line in the rows.