  We present an analysis of X-Shooter spectra of the polluted hydrogen-rich
white dwarfs (DAZ) NLTT 888 and NLTT 53908. The spectra of NLTT 53908 show
strong, Zeeman-split calcium lines (CaII H&K and Ca I $\lambda 4226$) and the
star appears to be a close relative of the polluted magnetic white dwarf (DAZH)
NLTT 10480, while the spectra of NLTT 888 show narrow lines of calcium and
iron. A comparison of the DAZ NLTT 888 and the DAZH NLTT 53908 with other class
members illustrates the diversity of environment and formation circumstances
surrounding these objects. In particular, we find that the incidence of
magnetism in old, polluted white dwarfs significantly exceeds that found in the
general white dwarf population which suggests an hypothetical link between a
crowded planetary system and magnetic field generation.
