  We present results of a high-statistics study of scalar and pseudoscalar
meson propagators in quenched QCD at two values of lattice spacing, beta = 5.7
and 5.9, with clover-improved Wilson fermions. The study of the chiral limit is
facilitated by the pole-shifting ansatz of the modified quenched approximation.
Pseudoscalar masses and decay constants are determined as a function of quark
mass and quenched chiral log effects are estimated. A study of the flavor
singlet eta prime hairpin diagram yields a precise determination of the eta
prime mass insertion. The corresponding value of the quenched chiral log
parameter delta is compared with the observed QCL effects. Removal of QCL
effects from the scalar propagator allows a determination of the mass of the
lowest lying isovector scalar $q\bar{q}$ meson.
