  Observations of the C IV and Mg II absorption lines in the Seyfert 1 galaxy
NGC 4151 obtained with the GHRS in October 1994 are presented. The data from
the STScI archive show multiple broad and narrow components in both species. In
addition to Galactic absorption, four narrow and four broad systems associated
with NGC 4151 are identified. Two broad systems dominate the total equivalent
width, and their mean blueshift and width are comparable to the broad Lyman
line and continuum absorption seen in far-UV spectra from the Hopkins
Ultraviolet Telescope. Narrow-line C IV emission is present on the red side of
the broadest absorption trough, and narrow absorption at the systemic velocity
of NGC 4151, presumably in its own ISM, absorbs the core of the narrow emission
line. Strong Mg II absorption is present in all but two velocity systems.
Ratios relative to the corresponding C IV components suggest a low ionization
parameter for the absorbing gas: U ~ 1-3 x 10^{-3}. This makes none of the
identified UV absorption systems a good candidate for association with the warm
X-ray absorbing gas.
