A SUMMER School organised by the Irish Chemical Association and held in Dublin during July 5-9 attracted 130 participants, of whom some thirty came from universities, hospitals and industrial concerns in Great Britain. The courses covered recent advances in various branches of chemistry. Dr. V. C. Barry, research fellow of the Medical Research Council of Ireland, dealt with the subject of chemotherapy with particular reference to tuberculosis. During his lectures he discussed some of the results obtained by the active school in Dublin of which he is the head (see Nature, 160, 800 ; 1947). Lectures were given on recent advances in the technique of organic chemistry by Prof. W. Cocker, professor of chemistry, Trinity College, Dublin. The last lecture of this particular series was delivered by Mr. E. R. Stuart, Trinity College, Dublin, who surveyed the methods of application of infra-red and ultra-violet radiation to the determination of the structure of organic compounds. Prof. E. J. Conway, professor of biochemistry and pharmacology, University College, Dublin, who has recently returned from a lecture tour in the United States, discussed biological oxidation and reduction, the nature of the cell membrane and the chemical interpretation of the action of hormones and vitamins, and concluded his course with a lecture on the biochemical approach to carcinogenesis. Prof. T. S. Wheeler, professor of chemistry, University College, Dublin, in a course of five lectures, gave a simplified account of the mathematical background of wave mechanics and described the application of the wave theory to problems in inorganic and organic chemistry. The School was opened by Mr. Michael Tierney, president of University College, Dublin, who referred to the responsibility of the man of science for the uses, good and bad, made of his discoveries.