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Born Ayrshire 1780; died Edinburgh 1848
Starting work as an apprentice gardener on estates in Scotland, William McNab moved to Kew in 1801, being promoted 3 years later to foreman. In 1810, on the recommendation of Joseph Banks, he was offered the post of principal gardener at the Royal Botanic Garden Edinburgh by the Keeper, Daniel Rutherford. Despite inadequate funding he set about developing the Garden, increasing the overall collection dramatically and introducing many new or rare plants, including mimosas, Australian banksias, and tropical water lilies. McNab was instrumental in the successful move of the Garden from Leith Walk to Inverleith under the Keeper, Robert Graham. He adapted a machine for transplanting well established trees, some over 40 feet high, details of which are included in his published paper on hardy evergreens (1830). His other main contribution to the literature was a treatise on cape heaths. McNab was a founder member of the Botanical Society of Edinburgh in 1836. Despite ongoing disputes over his salary, as a gardener and horticulturalist McNab was held in high esteem, as witnessed by the records of his testimonial dinner in 1844. He died in 1848 to be succeeded as curator of the Botanic Garden by his son, James.
Sources: Dictionary of National Biography; R. Desmond ‘Dictionary of British and Irish Botanists and Horticulturalists; HR Fletcher and WH Brown ‘The Royal Botanic Garden Edinburgh 1670-1970’; Deni Bown, ‘4 Gardens in One’; Gardeners Chronicle 1848, p 812
D.W.

James McNab was Principal Gardener at RBGE between 1848 and 1878.

Born Aberdeenshire 1851; died Dumfriesshire 1930
After graduating with an MB from Glasgow University in 1872, George Watt was appointed Professor of Botany at the University of Calcutta in 1873 which in turn led to his entry into the Indian Government Service. His many appointments during 22 years in the service ranged from Secretary of the Indian Revenue and Agricultural Department 1884, Commissioner for India at the Colonial Exhibition London 1885-86, President of the Pharmacological Section, Indian Medical Congress 1894, Officer in Charge Industrial Museum, Calcutta 1894-1903, and Reporter on Economic Products to Government of India 1887-1903. He retired from the Indian Service in 1903 and returned to Britain where he continued scientific research. In 1912 he visited Portuguese West Africa to study cocoa cultivation and for 5 years lectured on Indian botany at Edinburgh University. He was a prolific author drawing on experience in his many Indian postings. After 1910 he became actively involved in county life around his home in Lockerbie, serving on the county council, the local education authority and as a JP.
Sources: R. Desmond ‘Dictionary of British and Irish Botanists and Horticulturalists; obituary folder.
D.W.

Born Kincardineshire 1892; died Edinburgh 1960
Educated at Gordons College Aberdeen and Edinburgh University graduating MA with honours botany, John Macqueen Cowan completed his training in forestry at Oxford before being appointed to the Indian Forest Service in 1914. During ten years with the Indian Service he studied and classified vegetation and made considerable plant collections in Sikkim, Bengal and Burma, travelling with his wife, also a botanist. He was attached to the Indian Army during the First World War and served in Egypt and Palestine. On his return to India he officiated as Director of the Botanical Survey then as Superintendent of Royal Botanic Garden Calcutta from 1926, retiring in 1928. In that year he gained a temporary appointment as a botanist in the herbarium at Kew and in 1929 undertook botanical expeditions to Iraq and Persia principally to collect tulip bulbs but returning with 2,500 plant and herbarium specimens. In 1930 Cowan became assistant to the Regius Keeper of the Royal Botanic Garden Edinburgh, a post he was to hold for 24 years. Using the Garden’s extensive collections he became an authority on Rhododendron, publishing widely on this and other genera. During the Second World War he was seconded to the Ministry of Supply build up timber production in west of Scotland. Cowan was President Botanical Society of Edinburgh from 1951 to 1953. On retirement in 1954 he took charge of the National Trust for Scotland (NTS) Garden at Inverewe in Wester Ross developing it into a major visitor attraction, and also inaugurated the prestigious NTS garden cruises.
Sources: R. Desmond ‘Dictionary of British and Irish Botanists and Horticulturalists); HR Fletcher and WH Brown ‘The Royal Botanic Garden Edinburgh 1670-1970’; obituary folder.
D.W.

Robert Kaye Greville was an English botanist, mycologist and bryologist. He was also an excellent illustrator.