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{\bf Abstract Registration Number 549} \\
{\bf Parallel sessions: 5,3} \\
{\bf Plenary sessions: 7,5}
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\abstractheader{\bf Dijet Cross Sections in Photoproduction and Determination
         of \\ the Gluon Density in the Photon\\
H1 Collaboration, DESY}

\abstractbody{
 Using 1996 data from the H1 detector at the HERA collider
 the differential di-jet cross section $d\sigma / dx_\gamma^{jets}$
 is measured in photoproduction processes, extending the previously accessible
 range of the parton fractional energy  down to  $x_\gamma^{jets} = 0.04 $.
 The measurement is compared with predictions based on leading order
 matrix elements complemented by parton shower mechanism and with NLO QCD
 calculations.
 The leading order gluon density of the quasi real photon is extracted.  
}

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