Born at Morriston, Glamorgan on 27 July 1901, only child of C G Dahne a general practitioner at Portardawe, Glamorgan, and Mabel Louise Thomas his wife, daughter of a Swansea dental surgeon. C G Dahne, whose father was a Danish metallurgist naturalised in Great Britain, was surgeon to the factories and mines and had been commended for bravery in several mining accidents. Logan Dahne was educated at Shrewsbury School, Pembroke College, Cambridge and St Bartholomew's Hospital qualifying with the Conjoint Diploma in 1927 and proceeding to the Cambridge Degrees in surgery in 1932 and in medicine in 1936. He was a resident at the Royal Berkshire Hospital, Reading and settled there in a general practice partnership with Norman Hooper FRCS, and Eric Beale MD. During the second world war he remained at his post in Reading, serving on many medical boards and on the Borough Council for five years. In 1948 he decided to specialise in otolaryngology, took his Cambridge MD with a thesis based on his extensive experience of tonsillectomy, and was appointed consultant in otolaryngology at the Royal Berkshire Hospital, where he originated allergy clinics in his department. He retired to Wales in 1966 and settled at St David's, where he involved himself in local affairs, but kept in touch with his English friends and former associations. Dahne was Chairman of the Reading Division of the British Medical Association 1939-43 and in 1960, and represented it at many central Representative Meetings from 1944 till 1966; he was President of the Oxford and Reading Branch 1940-41 and a member of the Association's Council 1948-59, when he was elected an Honorary Fellow of the BMA; from 1966 to 1971 he served on the West Wales executive. He was President of the Reading Pathological Society 1955-56, and a member of the Council of the British Society of Allergologists. In younger days Logan Dahne was a fine oarsman both at Shrewsbury and Cambridge, where he was in the winning crew of the Head of the River race; he belonged to the Leander Club for forty-eight years. Later interests which he cultivated assiduously were gardening, history, and heraldry, in which his skill enabled him to design arms for the Royal Berkshire Hospital and the BMA. Dahne married in 1928 Mary Katharine, daughter of Martin Randall MD, FRCS; Mrs Dahne was herself a Cambridge graduate in Arts; her brother and several cousins were in medical practice. He died at St David's on 12 June 1971, six weeks before his seventieth birthday; he had successively survived severe coronary thromboses in 1952 and 1969. The funeral service was held in St David's Cathedral, he was survived by his wife and their married daughter.