Born 21 May 1891, the only child of Robert Robertson (1864-1925), of the Indian Medical Service, and his wife Flora Mackinnon. His father was ultimately a lieutenant-colonel, IMS, and senior physician to the Madras General Hospital (Crawford's *Roll of the IMS*, Madras list, No 1500). Robertson was

Born 26 November 1888, the elder son of Frank Marsh, FRCS, and Constance Hooper, his wife, who outlived her son. He was educated at Shrewsbury and at Trinity College, Cambridge, where he graduated with second-class honours in the Natural Sciences Tripos in 1910. He then entered St Bartholomew's,