a buoyant liquid becomes non-turbulent or even ceases upon loss of Evidence from experiments and theoretical modeling suggests that the superheat. Transferring these results to magmatic systems, we systems crystallizing exclusively from the top down and rejecting a suggest that the dynamics inside intrusive bodies upon cooling are buoyant liquid effectively cease convecting once the initial superheat very sensitive to the actual phase diagram, the kinetics of cryshas been lost. We report here on a combined experimental and tallization and the density relation between crystals and melt. theoretical study designed to investigate in some detail the interaction of convection and crystallization in a fluid cooled from above. The experiments are carried out in a small tank where temperature, composition, mush thickness, and convective velocities have been monitored. After an initial period of turbulent convection removing