The electric excitation process has become an extremely useful tool in the study of nuclear energy levels. Most of the accumulated data have been satisfactorily interpreted with the aid of a semi-classical approach combined with the unified model (Bohr & Mottelson I953). The W.K.B. method (Alder & Winther I954) gives a better approximation to the motion of the charged particle, and describes quite accurately the energy dependence of all observed electric dipole and quadrupole excitations. It agrees to within a small percentage with exact quantummechanical calculations (Biedenharn, McHale & Thaler I955; Biedenharn, Goldstein, McHale & Thaler 1956), which use Coulomb wave functions. Alder & Winther also give formulae and data for calculating cross-sections for electric and magnetic excitations of other multipolarity; none of these have so far been observed because of their very small cross-sections. Since we can produce large proton beams in the energy range of interest, with the high-tension set of the Cavendish Laboratory, we decided to look for the delayed activity following the electric excitation process. In this way we hoped to find out whether the W.K.B. treatment adequately described E3 excitations. Of the known transitions from an excited nuclear state to a stable ground state that have been classified as E3 (Goldhaber & Sunyar I955), only four are amenable to practical investigation by Coulomb excitation. These are in 107Ag, 109Ag, 77Se and '03Rh. The pertinent isomeric states in Ag and Se have relatively short lifetimes of about 40 and 17-s respectively, which are likely to be obscured by the usual short-lived activities from deposits on the target. The transition. to the 40 keV level in 103Rh was the first one we studied; the long lifetime (57 min) allows us to remove most of the spurious activity, which is due chiefly to carbon from oil deposits on the target. This level is easily excited by inelastic neutron scattering, and calibration sources were readily obtained by bombarding rhodium with Be(d, n) neutrons from the Cavendish cyclotron. The positions and properties of the levels in '03Rh below 800 keY have been inferred from the results of several ,8and y-spectroscopic studies of the decays of