The foregoing briefly describes the processes of direct printing. In this case, the penetration of the colors to the opposite side of the goods is not very good. If a solid and full ground color is needed both on the face and back of the goods, it can be had either by the "Resist" or "Reserve" method, or by the "Extract" or "Discharge" method. In the "Resist" method, when a white figure is wanted on a black or colored ground, the goods are first printed with some substance which will resist the action of the dye stuffs. Then, when the goods are dyed, the treated part does not take the color and the substance used as a resist is washed out, and thus a white figure is obtained on a solid colored ground. In the "Discharge" method, the goods are first dyed in a solid color, and are then treated with certain chemicals which destroy the dyed color wherever they touch the fabric, these chemicals being subsequently washed out where they have been applied, and thus again a white figure can be had in the colored ground. By the "Discharge" method, moreover, colored figures can also be printed on colored grounds, as certain colorings have been developed which are not affected by the discharge materials used, hence, a whole series of beautiful colors can be printed on goods previously dyed with black or colored grounds, each color being mixed with a suitable chemical for discharging the ground color, and thus the colors of the printed pattern come out as desired. Another important process which is applied to both cotton yarn and cotton fabrics is that known as mercerization, called after "Mercer" an English chemist who introduced the process. Cotton when subjected to the action of strong, caustic alkali contracts violently, but when again stretched and straightened it is found to have acquired a distinct silkiness of appearance, and under the microscope the twisted ribbon-like fibers of the material--already referred to--will be found to have become straight, glossy and rodlike, just as a bicycle tire would appear after air was blown into it. Cotton may be mercerized either in the yarn, warp, skein, or in the piece, the first being more effective. The best and most satisfactory results are achieved when the material treated is made of fine long staple cotton, either Sea Island or Egyptian, the shorter cottons being relatively much less improved by the treatment. The mercerizing does not diminish the strength of the material, and gives to it a greater affinity for dye stuffs. Internal Organization of Cotton Mills The foremen are specialists in their particular departments. The warehouseman, at one end, is a judge of cotton stock, and the foreman of the weaving room at the other knows how many automatic looms may safely be trusted to each weaver on his staff.