XEROGRAPHIC APPARATUS FOR THE MAGNETIC BRUSH DEVELOPMENT OF LATENT ELECTROSTATIC IMAGES WITH A TWO-COMPONENT MAGNETIC DEVELOPER. THE APPARATUS INCLUDES A PLURALITY OF ROLLERS WITH MAGNETIC FIELDS EXTENDING THEREFROM POSITIONED ADJACENT A LATENT ELECTROSTATIC IMAGE BEARING SURFACE TO BE DEVELOPED WITH THEIR AXES OF ROTATION PARALLEL TO EACH OTHER. DRIVE MEANS ARE PROVIDED TO ROTATE EACH ROLLER IN A DIRECTION OPPOSITE TO EACH ADJACENT ROLLER. IN THIS MANNER, ALTERNATE ROLLERS FUNCTION AS MAGNETIC BRUSH DEVELOPING ROLLERS WHILE THE INTERMEDIATE ROLLERS FUNCTION AS DEVELOPER TRANSPORT ROLLERS TO MAGNETICALLY TRANSPORT THE DEVELOPER FROM ONE DEVELOPING ROLLER TO THE NEXT. WHEN A SUMP OF DEVELOPER IS PROVIDED ADJACENT THE LOWERMOST ROLLER, GRAVITY MAY BE UTILIZED TO RETURN DEVELOPER FROM THE UPPERMOST ROLLER TO THE SUMP. BAFFLES MAY ALSO BE EMPLOYED TO CROSS-MIX DEVELOPER RETURNING TO THE SUMP.