The eldest son of Dr James Johnson, whose birth name was properly Johnstone, but by a clerical error at the Admiralty in his Commission as Assistant Surgeon his surname was spelled Johnson, and he appeared as such in the Navy List. There was no way to get the error corrected, and as Johnson he becam

Was articled to John Merriman, of Kensington, studied at Great Windmill Street School, and in 1825 entered St George's Hospital, where in 1838 he was House Surgeon; in 1834 he was Surgeon to the Pimlico Dispensary. He lectured and demonstrated on anatomy at Kinnerton Street, lying to the west of St