  We examine the effect of a rapidly migrating protoplanet on a ring of
planetesimals. The eccentricities of the planetesimals are usually increased by
$\Delta e \in (0.01, 0.1)$, with the exact increase being proportional to the
protoplanet's mass, and inversely proportional to its migration rate. The
eccentricity distribution is also substantially changed from a Rayleigh
distribution. We discuss the possible implications for further planet
formation, and suggest that the rapid passage of a protoplanet may not prevent
the planetesimal disc from forming further planets.
