  Rhombic cell analysis as outlined in the first paper of the present series is
applied to samples of varying depths and liming luminosities of the IRAS/PSCz
Catalogue. Numerical indices are introduced to summarize essential information.
Because of the discrete nature of the anlaysis and of the space distribution of
galaxies, the indices for a given sample must be regarded as each having an
irreducible scatter. Despite the scatter, the mean indices show remarkable
variations across the samples. The underlying factor for the variations is
shown to be the limiting luminosity rather than the sampling depth. As samples
of more and more luminous galaxies are considered over a range of some 2
magnitudes (a factor of some 50 in space density), the morpholgy of the filled
and empty regions the galaxies define degrades steadily towards insignificance,
and the degrading is faster for the filled than the empty region.
