The son of a surgeon at Hounslow; received his Medical education at the Windmill Street School and at St George's and Westminster Hospitals. On account of his father's failing health, he entered into active practice at once after qualifying. So great was his energy and determination of character, it is said, combined with rare professional knowledge and skill, gentlemanly manners, and an address which inspired confidence, that he speedily established himself in a lucrative and extensive practice, which he carried on alone until the year 1889. Among his pupils who distinguished themselves were Samuel Lane, and Christopher B Emmott of Egham. He took the latter into partnership, and on Emmott's retirement was associated with Thomas Warburton Benfield, afterwards Surgeon to the Leicester Infirmary. From 1849-1854 his partner was Dr Alfred Hall, of Brighton, succeeded by F R A Douglas and Henry Bullock, who carried on Frogley's practice after his death. Frogley was well known as a skilful accoucheur and operator. He tied the carotid and femoral arteries, cut for stone, and on one occasion amputated the thigh close to the hip-joint, the patient suffering from an enchrondroma. The amputated limb weighed four stone, upwards of a third of the patient's body, but the patient survived for years. He published this case and another like it in the *Medico-Chirurgical Transactions*, xxvi, 133. He was widely sought after in consultation. He was at different times Medical Officer to the Parishes of Feltham, Bedfont, Norwood, Hanworth, Heston, Cranford, and Harlington, to the School of St George's and St Giles's Bloomsbury, at Heston; and was also Surgeon to the 'T' Division of Police, and to Curtis and Harvey's large powder mills. Frogley is described as one of the most able of the hard-working surgeons who have devoted their time and energies to practice in what was then a country district - a position in which all the capabilities of the physician and operative surgeon may at any time be called into requisition. He stood well with his socially important patients and was noted for his great kindness to the poor. Despite his hard professional labours he cultivated a large farm for many years and was known as a good judge of stock. He was instrumental in obtaining the erection of Hounslow Town Hall. He died at Brighton on March 15th, 1864, and was buried at Hounslow.