The only son of Dr Thomas Cahill (d.1881), of 9 (now 88) Albert Terrace, Knightsbridge. Coming of an old Roman Catholic family, he was educated at Beaumont College, Windsor, and was sent to Germany for two years to learn the language. He entered St George’s Hospital in 1877, where he served as House Surgeon. He began to practise at 12 Seville Street, Lowndes Square, and remained there for thirty years. His inclination being towards surgery, he was appointed Surgeon to the Hospital of St John and St Elizabeth, but after taking the MD of Durham he devoted himself to medicine as it occurs in general practice. He acted as Medical Adviser to the Egyptian Civil Service and was a Member of the Medical Commissioners’ Board. Throughout his life he was much interested in the fortunes of St George’s Hospital, and was for some years a member of the Committee of Management. He worked arduously and unselfishly during the scarcity of medical men from 1914-1918, and acted as Temporary Assistant Physician at the hospital. He married in 1887 Lucy Keith, youngest daughter of Thomas Keith, CB, Accountant-General at the India Office, who, with two daughters, survived him. His only son, Captain Archibald Cahill, MC, of the Royal Berks Regiment, was killed in action in 1917. John Cahill died on Sept 6th, 1919, at Pinckney’s Green. Publications: “A Tumour involving Trachea and Œsophagus in the Neck.” – *Trans. Pathol. Soc.*, 1891, xlii, 91. “A Case of Tuberculous Lymphangitis.” – *Brit. Jour. of Dermatol.*, 1895, vii, 1. “A Case of Downward Displacement of the Female Breast resulting from Pressure.” – *Trans. Clin. Soc.*, 1899, xxxii, 255. “A Note on Ptomain Poisoning.” – *Lancet*, 1898, ii, 1122. With Sir W H Bennett: “A Case in which Acute Appendicitis and a Twisted Ovarian Pedicle existed at the same time.” – *Lancet*, 1906, ii, 1585.