  Large wavelength shifts of infrared triplet lines of Ca II have been observed
in the spectra of HgMn and magnetic Ap stars. They have been attributed to the
heavy calcium isotopes, including Ca-48. One member of the triplet,
$\lambda$8542, had been either unavailable, or of poor quality in earlier
spectra. The present material shows conclusively that the stellar $\lambda$8542
shifts are consistent with an interpretation in terms of Ca-48. We find no
relation between isotopic shifts of the Ca II triplet lines, and those of Hg II
$\lambda$3984. There is a marginal indication that the shifts are {\it
anticorrelated} with the surface field strengths of the magnetic stars. We see
sparse evidence for Ca-48 in other chemically peculiar stars, e.g. Am's,
metal-poor stars, or chemically peculiar red giants. However, the sample is
still very small, and the wavelengths of all three triplet lines, including
those in the Sun, show slight positive shifts with respect to terrestrial
positions.
  Some profiles of the Ca II infrared triplet in the magnetic stars show
extensive wings beyond a well-defined core. We can obtain reasonable fits to
these profiles using a stratified calcium abundance similar to that used by
previous workers. There is no indication that either the stratification or the
Zeeman effect significantly disturbs the measurement of isotope shifts.
