The angle 6 is the polar angle of the nucleon relative momentum with respect to the incident-proton direction in the total center-of-mass system. The angles 6± and 02 are the polar angles of the two mesons with respect to this direction, also in the total center-of-mass system, if one neglects the transformation from the rest system of each isobar. By integration over the meson angles in Eqs. (3) and (4), we can get an idea of the angular distribution of the final-state nucleons that could arise from inclusion of the P-wave motion of the intermediate-state isobars. For the transition from the 3 Po state, we have S EVERAL experiments have been performed to investigate photofission cross sections in the energy region 100 to 300 Mev. 1-5 In the experiment here presented we have investigated the photofission cross sections of U 238 , U 235 , Th 232 , Bi 209 , and Au 197 for photons produced in bremsstrahlung spectra whose maximum energies ranged from 150 to 500 Mev. The energy region 150 to 335 Mev was investigated for the most part at the University of California synchrotron, whereas the higher energy data were obtained at the synchrotron of the California Institute of Technology. In a previous paper 6 (hereafter referred to as A) we have reported the high-energy proton-induced fission cross sections of the above elements. The same apparatus and essentially the same methods were used in the measurement of the photofission cross sections.