This study experimentally examines the flow of glass spheres ina a wedge-shaped hopper that is vibrated horizontally. When the hopper is discharged without vibration, discharge occurs in a funnel flow, with the material exiting the central region of the hopper and stagnant material along the sides. With vibration, the discharge of the material occurs in reverse, with the material along the sides exiting first, followed by the material in the central region. These patterns areobserved with flow visualization and high-speed photography. The study also includes measurements of the discharge rate, which increases with the amplitude of the velocity of vibration.