Adopted in 1902, these rules govern all transactions of a financial, mercantile or commercial nature involving grain. Grain, as defined by the U.S. Grain Standards Act, means corn, wheat, rye, oats, barley, flaxseed, grain sorghum, soybeans, mixed grain and any other food grains, feed grains and oilseeds for which standards are established under 7 U.S.C. Section 76.