We have discovered that the white dwarf PG 2329+267 is magnetic, and assuming
a centered dipole structure, has a dipole magnetic field strength of
approximately 2.3MG. This makes it one of only approximately 4% of isolated
white dwarfs with a detectable magnetic field. Linear Zeeman splitting as well
as quadratic Zeeman shifts are evident in the hydrogen Balmer sequence and
circular spectropolarimetry reveals 10% circular polarisation in the two
displaced sigma components of Halpha. We suggest from comparison with spectra
of white dwarfs of known mass that PG 2329+267 is more massive than typical
isolated white dwarfs, in agreement with the hypothesis that magnetic white
dwarfs evolve from magnetic chemically peculiar Ap and Bp type main sequence
stars.Comment: 5 pages, with 2 encapsulated postscipts figures include