Every thresherman purchasing a new machine wants to do just a little better work than his neighbor. It is therefore important that he should operate his machine properly in every particular. He should make every adjustment necessary to do good work. The cylinder should be run at the proper speed and the concaves adjusted to meet the existing conditions and kind of grain, so that all the heads will be threshed clean of every kernel. The more perfect the threshing, at the cylinder, the nearer the approach to perfect separation.