  We have obtained Keck HIRES spectra of three images of the gravitationally
lensed QSO 2237+0305 to study low ionization absorption systems and their
differences in terms of projected velocity and column density across the lines
of sight. We detect CaII absorption from our Galaxy, and a system of High
Velocity Clouds from the lensing galaxy (z=0.039). CaII components with total
equivalent widths similar to those of Galactic intermediate and high velocity
clouds are spread out over several hundred km/s at impact parameters of less
than one kpc from the center of the lensing galaxy. We have also studied three
low ionization MgII-FeII systems in detail. All three systems cover all three
lines of sight, suggesting that the gaseous structures giving rise to MgII
complexes are larger than about 0.5 kpc. However, in most cases it is difficult
to trace individual MgII `cloudlets' over distances larger than 200-300 pc,
indicating that typical sizes of the MgII cloudlets are smaller than the sizes
inferred earlier for the individual CIV high ionization gas clouds. We
tentatively interpret the absorption pattern of the strongest MgII system in
terms of an expanding bubble or galactic wind and show that the possible loci
occupied by the model bubble in radius-velocity space overlap with the observed
characteristics of Galactic supershells. (abridged).
