The pulsar PSR 0329+54 was observed at 408 MHz simultaneously for an entire day at Jodrell Bank and Penticton. The separation of these stations is sufficient to permit detection of motions of the diffraction pattern produced by irregularities in the interstellar medium. The present observations suggest that the scintillation pattern is stable. If this is the case, then the results indicate a decorrelation length of 77 000 km and a velocity of 360 km 5-i at position angle 2950 referred to the local standard of rest. This velocity is high compared to most motions in the Galaxy but it is consistent with velocity estimates made on the basis of single telescope observations. The motion can be attributed to either the interstellar plasma or the pulsar itself. Although this experiment does not distinguish between these two possibilities, it may indicate the existence of high pulsar velocities required by certain theories of pulsar formation.