Although most work is executed throughout by one or other of the five distinct processes mentioned above, combinations of them are not infrequently employed. Sometimes a pattern is printed partly by machine and partly by block；and sometimes a cylindrical blockis used along with engraved copper-rollers in the ordinary printing machine. The block in this latter case is in all respects, except that of shape, instead with a flat wood or coppered block, but, instead of being dipped in color, it receives its supply from an endless blanket, one part of which works in contact with color- furnishing rollers and the other part with the cylindrical block. This block is known as a surface or peg roller. Many attempts have been made to print multicolor patterns with surface rollers alone，but hitherto with little success, owing to their irregularity in action and to the difficulty of preventing them from warping. These defects are not present in the printing of linoleum in which opaque oil colors are used，colors that neither sink into the body of the hard linoleum nor tend to warp the roller.