Abstract
The equivalent width distribution of Ca II K absorption lines seen in lines-of-sight through the galactic halo is constructed from an unbiased sample of extragalactic sightlines. The absorption by the interstellar medium of our own Galaxy is compared with that seen in the spectra of QSOs lying behind low-redshift galaxies. The Ca II absorption seen in several QSO spectra apparently arises in material deposited inhomogeneously around the foreground galaxy, perhaps as a result of earlier galaxy interactions or mergers
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