While at TCD, Barrington met
Alexander Goodman More, with whom he became a close friend who influenced him greatly. Barrington would go on long summer excursions to mountains, islands and lakes in the south and west of Ireland, taking notes on birds and plants. He wrote reports on the
flora of
Lough Ree,
Lough Erne,
Ben Bulben,
Tory Island and the
Blaskets all published by the
Royal Irish Academy as part of More's
Cybele Hibernica (1872). Primarily, Barrington's scientific papers are on
birds. His best known work is
The migration of birds, as observed at Irish lighthouses and lightships including the original reports from 1888 to 1897, now published for the first time, and an analysis of these and of the previously put together with an appendix giving the measurements of about 1600 wings London : R.H. Porter. Only 350 copies of this 667 page work were printed. This work was based on the correspondence he began with lighthouse keepers on bird migration in 1882. The work was funded until 1888 by the
British Association's migration committee, after which point, he funded it himself. The book included numerous new Irish records, and the specimens he received were either deposited in the
National Museum of Ireland of in his own personal museum in Fassaroe. with
William Spotswood Green.
Robert Lloyd Praeger,
William Francis de Vismes Kane, and
John A. Harvie Brown of
Dunipace, a Scottish gentleman naturalist, also took part. Travelling on the
SS Granuaile, the expedition aimed to record and collect geological and biological specimens, and investigate the potential of establishing a meteorological station there. The expedition did not land due to high seas, but were the first to record the birds of Rockall, and discounted the possibility of a meteorological station. Barrington was a member of the Royal Irish Academy,
Royal Dublin Society,
Irish Society for the Protection of Birds,
Statistical and Social Inquiry Society, and the
Royal Zoological Society of Ireland. He was a founding member of the Dublin Naturalists' Field Club. He was also a
Fellow of the
Linnean Society, a Member of the
British Ornithologists' Union, and of the British Association Committee for obtaining Observations on the Migration of Birds at Light- houses and Lightships formed to study
bird migration. He was also interested in mammals, meteorology, agriculture, wider Irish science and economics. He also travelled widely:
Iceland in 1881, remote Scottish islands in 1883, 1886, and 1890, and
Switzerland in 1876 and 1882. He climbed many of the peaks in the
Alps, such as the
Eiger in 1876, and in 1884, he walked across the
Rockies. He reached 6 peaks in the Alps in 10 consecutive days as a members of the British Alpine Club. It was reported that his brother,
Charles, was the first person to climb the Eiger in 1858. == Death and legacy ==