Many ships will go to Panama which will not use the canal. For instance, there will be those which will leave European ports, loaded in part with cargo bound to Pacific points and in part with cargo for Atlantic points on the South and Central American coast. Such ships will simply call at Colon, discharge their cargo bound to Pacific points, and take on what additional cargo they can get bound for points for which they are sailing on the Atlantic side. In stopping at Colon they will probably replenish their supplies from the commissary department of the canal. What the freight department is to a railroad the cargo ship will be to the Panama Canal--its greatest revenue producer. Such ships will do comparatively little loading and unloading of cargo at either end of the canal. The tramp steamer will figure largely in the traffic that passes from ocean to ocean at Panama. With no schedule of sailing dates and with no definite routes, the tramps constitute the flying squadron of the shipping world, moving hither and thither seeking cargoes wherever they can find them. A tramp steamer may load at Liverpool for San Francisco, reach that point through the Panama Canal, and, after discharging its cargo, go on up to Seattle and load for China. There it may discharge its cargo again and go thence to India to pick up a load of grain for Liverpool, passing through the Suez Canal. Its master always will turn its prow to the point where profitable cargo awaits it, and this may carry it by Panama once or a dozen times a year. The line steamers will have their regular sailing dates and will pass through the canal at stated intervals.