Perhaps you have noticed that rice kernels have a bluish appearance. This is not natural, but is the result of polishing. The polishing removes much of the best part of the grain, but the rice sells for a higher price simply on account of its appearance. The polishing machine is cylindrical or drum-like in shape. Moosehide or sheepskin is tacked to the cylinder. It is made to revolve rapidly, so that the kernels are polished as they pass over the skin. After being polished the kernels are run through screens and sorted. The rice is then put up in barrels or sacks and shipped. HOW SUGAR IS MADE [Illustration: FIG. 24.--Sowing Sugar Seed.] This picture represents one of the beginnings of the great industry of sugar making. The small objects which you see in the trenches are pieces of sugar cane. These "cuttings," as they are called, are covered with soil. They soon sprout, and from them grow the tall, waving fields of cane, which resemble cornfields. The canes are taller than cornstalks, however. How high do you think those shown in the picture are? In about ten months after planting the cane is ready to cut. In the Southern states this work usually begins about the middle of October. [Illustration: FIG. 25.--Cutting Sugar Cane.] The canes are jointed, as cornstalks are, and the spongy substance between the joints is filled with a sweet juice. It is from this juice or sap that cane sugar is made. I have seen children chew pieces of the cane, and enjoy it as you do candy; for this use it is sometimes sold in stores in the South. [Illustration: FIG. 26.--Loading Cars with Sugar Cane.] After the canes are cut they are hauled to the mill or sugarhouse on wagons. On the large plantations _tram cars_ sometimes run right into the fields. At the mill the canes are run between heavy rollers, which squeeze out the sap. Sometimes as many as seventy-five pounds of sap are obtained from one hundred pounds of cane. The crushed stalks are used in the mill for fuel, and the ashes are returned to the land to fertilize it. When the juice is first pressed out, it is not at all clear in color. It is then placed in great vats or kettles and heated. This heating causes the water which is in the sap to evaporate, and it also brings some of the impurities to the top, where they are skimmed off. When the evaporating has been finished, there are two products, molasses and brown sugar. The sugar must next be refined. For this purpose it is usually sent to cities outside of the sugar belt. There are great refineries in New Orleans, San Francisco, St. Louis, Chicago, and other cities.