This is to describe the kinetics of crystallization from the quiescent melt of two aliphatic polyketones (Shell Carilon) and to document a new device called 'Thin Slice Experiment II' that allows to determine the number of nuclei and the growth speed of spherulites of fast crystallizing polymers in the entire temperature range from the glass point to the melting point. (C) 2001 Elsevier Science Ltd. All rights reserved.