THE Royal Photographic Society, at its house at 35 Russell Square, is holding an exhibition of kinema-tography until November 30. The exhibition will be open from 10 a.m. to 6 p.m. daily, and a number of public lectures has been arranged. Admission is free. Particulars may be obtained from the Secretary of the Society. The opening lecture was given on November 6 by Mr. F. F. Renwick who described the Dufay colour process. As already mentioned in NATURE (133, 678; 1934), this process was to be made available to users of 16 mm. kine film during the summer of this year. When the film was issued it was found to be extremely successful. In his lecture, Mr. Renwick stated that a very large amount of research work had been carried out relating to the application of the process to the full-size kine film. In making copies, much progress had been made, and he was able to exhibit samples made both by projection and contact printing. This accomplishment has already been followed by prominent film-producing companies, and soon Dufay colour films will, no doubt, be included in screen programmes.