Carte de visite photograph by F Joubert. In 1851, Hasall (1817-1894) became a physician at the Royal Free Hospital, London, in 1851. He mainly wrote on hygiene and public health, and his work on the adulteration of food led to a Parliamentary act outlawing such practices. He was founder and consulting physician to the Royal National Hospital for Consumption and Diseases of the Chest at Ventnor, Isle of Wight, where there were 130 separate bedrooms for treating sufferers of tuberculosis and other complaints. He gave his name to Hasall's corpuscles.
© Science Museum / Science & Society Picture Library