  The foreground component of the X-ray Background (XRB) can be studied by
cross-correlating its intensity with galaxy catalogs. We computed the two-point
cross-correlation function $W_{xg}$ between 67 {\em Einstein} X-ray fields and
the APM galaxy catalog. We detected a signal with an amplitude of $W_{xg} = .04
\pm .01$, significant at the $3.5\sigma$ level. The reality of this signal was
tested with a series of control data sets. We discuss how this signal can be
used to constrain models of the XRB.
