Revised edition. "This bulletin suggests certain combinations which approximately meet the needs of horses under varying conditions and reviews such factors of feeding as tend to make the horse more efficient." -- p. ii

Revised edition. "Farmers who have been accustomed to laying out their fields for plowing with horses and an ordinary plow are often puzzled as to the best method to adopt when they change to the tractor. For not only are the two methods different, but a lay-out admirably suited to a tractor of one size under certain field conditions may not do for one of some other size under other conditions. This bulletin describes methods and plans for laying out fields for tractor plowing suited both to rectangular fields and to fields of irregular shape." -- p. ii