Born on October 3rd, 1880, the only son of William Lang, FRCS, Consulting Ophthalmic Surgeon to the Middlesex Hospital and to the Royal London Ophthalmic Hospital, Moorfields. Educated at Abbotsholme School in Derbyshire, he entered Trinity College, Cambridge and graduated BA with first class honours in the Natural Science Tripos in 1902. He then entered St Bartholomew's Hospital, and served as House Surgeon to W Bruce Clarke (qv) and Ophthalmic House Surgeon in 1906-1907 to W H H Jessop (qv) and T Holmes Spicer. For some years he spent his time in clinical appointments in the eye wards at St Bartholomew's, at Moorfields, at the Royal Westminster and Central London Hospitals whilst assisting in the practice of his father in Cavendish Square. During the European War he was mobilized in August, 1914, with No 8 General Hospital, which was stationed on the heights above Rouen. His fluent knowledge of French, his industry, and his engineering capability made him especially useful, and in addition to his ophthalmic work he undertook the X-ray department, proving himself so successful that he was ordered to take a mobile X-ray apparatus round the front line. He resumed practice at the end of the War, became Assistant Surgeon to the Western Ophthalmic Hospital, Hon Ophthalmic Surgeon to St Andrew's Hospital, Dollis Hill, Surgeon to the Royal Eye Hospital, and Visiting Ophthalmic Surgeon to the Royal Northern Hospital in Holloway Road. He died of pneumonia on January 18th, 1928, survived by his wife, whom he had married eleven months previously. There was no child. Lang was possessed of great mental power somewhat dissipated by the number of his interests. He made a hobby of colour photography, and obtained most satisfactory results; as an ophthalmic surgeon he was a refractionist more than an operator.