The injection of a plasma stream into a transverse magnetic field by polarization andE × Bdrift is considered in terms of a simple model. An estimate of the peak flux density that the plasma can enter is discussed. An expression for the magnitude of the diamagnetism associated with the particle velocity distribution is indicated. Experiments on the motion of a plasma stream through regions of shorted (or tied) field lines show that a sheath forms on the shorting electrode and that the plasma can penetrate through the shorted lines because the discharge current is limited to the ion saturation current. An expression for the stopping distance is derived.