Born on December 20th, 1853, the son of Captain George Giles, RN, of Plymouth, and received his professional training at St Mary's Hospital, where he was House Surgeon. He served as a Civil Surgeon in South Africa in the operations against the Galekas in 1878 and in the Zulu War of 1879. For these services he received the Medal and Clasp. He entered the Indian Medical Service as Surgeon on October 2nd, 1880, became Surgeon Major on October 2nd, 1892, and Lieutenant-Colonel on October 2nd, 1900, retiring on January 5th, 1901. During this period he made important contributions to animal and human parasitology in the tropics. He spent some years as Surgeon Naturalist in the Indian survey ship, the Royal Indian Marine steamer *Investigator*, and in 1886-1887 accompanied the late General Sir William Lockhart on an exploring expedition in the Pamirs. Later he was employed in a civil capacity in the Central Provinces, and was then transferred to the Sanitary Department in the North-West (afterwards the United) Provinces. He lived after his retirement at 3 Elliot Terrace, The Hoe, Plymouth, and at Crown Hill, South Devon. In 1912 he emigrated to Portsmouth, County Frontenac, Ontario, Canada, whence he returned to England, having joined the Canadian Army Medical Service, shortly after the outbreak of the Great War (1914-1918). He was for some time in charge of Burcote House Hospital, Abingdon, but was compelled to resign his post owing to ill health in March, 1916. He died at Plymouth on August 24th, 1916. Publications: "Micro-photography." - *Month Micros Jour*, 1876, xv, 26. *A Report of an Investigation into the Causes of the Diseases known in Assam as Ka'la-Az'ar and Beri-Beri*, 8vo, 4 plates, Shillong, 1890. *Tea-garden Sanitation, being a Few Remarks on the Construction of Coolie-lines and the Sanitary Management of Coolies, with Special Reference to the Prevention of the Disease known as Anaemia of Coolies, Beriberi, and Anchylostotniasis*, 8vo, Shillong, 1891. "Some Observations on the Life-history of Scierostomum Tetracanthum, Diesing, and on Sclerostomiasis in Equine Animals; in Connection with a so-called Outbreak of Surra at Shillong," 4to, 3 plates, Calcutta, 1892; reprinted from *Sci Mem Off Army of India*, 1892, vii, 1. "On a New Sclerostome from the Large Intestine of Mules," 4to, plates, Calcutta, 1892; reprinted from *Ibid*, 25. "On Nodular Disease of the Intestine in Sheep," 4to, plate, Calcutta, 1892; reprinted from *Ibid*, 31. "A Description of the New Nematode Parasites found in Sheep," 4to, plate, Calcutta, 1892; reprinted from *Ibid* 45. *A Handbook of the Gnats or Mosquitoes, giving the Anatomy and Life History of the Culicidae*, 8vo, plates, London, 1900. This is his best-known work and is a classic. "Notes on Indian Mosquitoes," 8vo, London, 1901; reprinted from *Jour Trop Med*, 1901, iv, 159. "Captain Rogers' Recent Investigations in Malaria," 8vo, Calcutta, 1901; reprinted from *Ind Med Gaz*, 1901, xxxvi, 51. "On Pre-pupal Changes in the Larvae of the Culicidae," 8vo, 2 plates, London,1903; reprinted from *Jour Trop Med*, 1903, vi, 1S5. *A Revision of the Anophelinae, being a First Supplement to the 2nd ed of a Handbook of the Gnats*, etc., 8vo, London, 1904. "The Anatomy of the Biting Flies of the Genus *Stomoxys* and *Glossina*," 4to, illustrated, London, 1906; reprinted from *Jour Trop Med*, 1906, ix, 99, etc. *Supplementary Reports* (with R FIELDING-OULD) to Ross, Annett, and Austen's *Report of the Malaria Expedition of the Liverpool School of Tropical Medicine and Medical Parasitology*, 4to, Liverpool, 1900.