William Hellier Baily was born on July 7, 1819, in Bristol, Gloucestershire, England.

He was an English paleontologist. From 1837 to 1844 he was Assistant Curator in the Bristol Museum, a post he relinquished to join the staff of the British Geological Survey in London. In 1854, he became an assistant naturalist. In 1857, he was transferred to the Irish branch of the Geological Survey, as an acting paleontologist and senior geologist, and retained this post until the end of his life. He was responsible for the identification and curation of thousands of fossil specimens found in Ireland. He was the author of many papers on paleontological subjects, and of notes on fossils in the explanatory memoirs of the Geological Survey of Ireland. He published a useful work entitled “Figures of Characteristic British Fossils, with Descriptive Remarks” (1867–1875). He was also an accomplished artist and lithographer.

He died on August 6, 1888, in Dublin, Ireland.

He was a British aviculturist and ornithologist. At age 23, he went to California, where he enjoyed both birdwatching and duck shooting. He also visited Brazil, Norway, Spain and other parts of Europe. He began keeping birds in captivity (1910) and building a collection of approximately 1,000 aviary specimens. The Avicultural Society awarded him 36 medals for his achievements in captive husbandry and bird breeding.

Francis Bain was born on February 25, 1842, in North River, Prince Edward Island. 
 
He was a self-educated farmer, geologist, ornithologist, botanist, author, and artist. As a boy, he was fond of reading and developed a liking for natural science. After the death of his older brother in 1862, the family farm became his sole responsibility, with formal schooling curtailed, but Bain continued studies of classics, mathematics, French, and German on his own. In the 1860s, he began travelling all over the Island to pursue his interest in natural science. He considered himself foremost a geologist. He mapped the province’s bedrock and collected, illustrated, described, and identified many fossils. He also discovered a species of fossil fern on PEI that Sir William Dawson subsequently named Tylodendron baini. In 1892, he was commissioned by the federal government to investigate the feasibility of constructing a submarine tunnel from PEI to New Brunswick. Bain’s enthusiasm to share his learning led him to engage in extensive writing and lecturing. Between 1881 and 1893, he published over twenty scientific papers and two books, “The Natural History of Prince Edward Island” (1890) and “Birds of Prince Edward Island, Their Habits and Characteristics” (1891). He also published over fifty natural science articles in a half-dozen Canadian and American scientific journals. His articles included lists and records of birds, shells, plants, butterflies, fossils, and geological formations. His career as a public speaker on botany, geology, and the proposed tunnel to New Brunswick, often illustrated with his drawings, began about 1885. Bain's knowledge and understanding of natural science mark him as the first Islander to whom the contemporary term ecologist can appropriately be applied.
 
In 1875, he married Caroline Matilda Clark (1852–1913). He died on November 20, 1894, in North River, Prince Edward Island.

John Wilson Bain, Esq., was born on April 24, 1862, in Glasgow, Scotland.

He was an accountant and auditor in Glasgow, Scotland.

In 1903, he married Georgina Burn Oliver (1863–). He died on January 20, 1940, in Glasgow, Scotland.

William Alexander Bain was born on August 20, 1905, in Dunbar, Scotland.  

He was a Scottish pharmacologist, best known for his early work with antihistamine drugs. In 1928, he graduated from the University of Edinburgh with first-class honours in physiology. In 1930, he won the Ellis Prize in Physiology with an essay on heart hormones. In 1931, Bain was appointed Lecturer in Experimental Physiology at the University of Edinburgh and elected a Fellow of the Royal Society of Edinburgh. In 1934, Bain was appointed a lecturer at the University of Leeds, where he stayed for 25 years. He was awarded a D.Sc. degree from the University of Edinburgh in 1953 for his work entitled "Contributions to the study of histamine antagonists in man." From 1954 to 1957, Bain was Press Editor of the British Journal of Pharmacology and Chemotherapy. In 1958, he assumed the directorship of the new Smith, Kline and French Research Institute at Welwyn Garden City, England.

In 1929, he married Bessie Beveridge Smith (1900-1961), and, later, he remarried Freda Dratman (1912–2008). He died on August 24, 1971, in Digswell, England.