DR. JOHN L. D‘SILVA, reader in physiology at St. Bartholomew‘s Hospital Medical College, who has been appointed to the chair of physiology at the London Hospital Medical College, was born and educated in southern India. He graduated with first-class honours in chemistry at King‘s College, London, in 1929, and remained there for a further three years doing research on the chemistry of disulphides. In 1932 he went over to physiology, still at King‘s College, carrying out investigations on the effect of adrenaline on the metabolism of potassium. After a short period with Messrs. British Drug Houses, Ltd., spent on research into the molecular distillation of fish oils in connexion with the study of vitamin A, he went in 1936 to St. Bartholomew‘s Hospital Medical College, where he was demonstrator in physiology and in biochemistry, and continued his Work on the metabolism of adrenaline and potassium. He Was awarded the degree of D.Sc. for his published work. During the Second World War, Dr. D‘Silva qualified as a medical practitioner and also continued teaching. After work at St. Bartholomew‘s Hospital, in 1944 Dr. D‘Silva was appointed to the Medical College again and has remained there since, lecturing and carrying out research on the physiology of the visual process.