J//psi/ results from Mark III

Measurements of the two body decays of the J//psi/ into vector and pseudoscalar meson pairs are presented. Using the measured branching ratios, a phenomenological model of J//psi/ decays indicates that the /eta/ and /eta/' are composed only of light and strange quarks, without a gluonium contribution in the /eta/' wavefunction. A measurement of J//psi/ → γπ+π/sup /minus//π+π/sup /minus// is presented. The f1 (1285) is observed and its spin and parity are investigated. The /eta//sub c/ is observed to decay to /rho/0/rho/0, and first indications of /eta//sub c/ decays to f2f2 are presented. The spin and parity of the /eta//sub c/ are investigated. 5 figs., 3 figs., 1 tab