  Studies on the structure of the photon are presented by means of the
extraction of a leading order effective parton distribution in the photon and
measurements of inclusive jet differential cross sections in photoproduction.
Measurements of the internal structure of jets have been performed and are also
presented as a function of the transverse energy and pseudorapidity of the
jets. Dijet cross sections have been measured as a function of the dijet mass
and centre-of-mass scattering angle.
