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We present absorption-line strengths on the Lick/IDS line-strength system of381 galaxies and 38 globular clusters in the 4000--6400 \AA region. Allgalaxies were observed at Lick Observatory between 1972 and 1984 with theCassegrain Image Dissector Scanner spectrograph, making this study one of thelargest homogeneous collections of galaxy spectral line data to date. We alsopresent a catalogue of nuclear velocity dispersions used to correct theabsorption-line strengths onto the stellar Lick/IDS system. Extensivediscussion of both random and systematic errors of the Lick/IDS system isprovided. Indices are seen to fall into three families: \alpha-element-likeindices (including CN, Mg, Na D, and TiO_2) that correlate positively withvelocity dispersion; Fe-like indices (including Ca, the G band, TiO_1, and allFe indices) that correlate only weakly with velocity dispersion and the \alphaindices; and H\beta which anti-correlates with both velocity dispersion and the\alpha indices. C_2 4668 seems to be intermediate between the \alpha and Fegroups. These groupings probably represent different element abundance familieswith different nucleosynthesis histories.Comment: 44 pages, including 14 embedded .eps figures plus 4 external tables.  Accepted to the Astrophysical Journal Supplement Series, May 1998. ASCII  format data for tables are available at  ftp://ftp.ucolick.org/pub/users/sctrager/galaxies/ids/tables/ and FITS  spectra are available on request from the first autho

Old Stellar Populations. VI. Absorption‐Line Spectra of Galaxy Nuclei and Globular Clusters