Written by The Carmina Gadelica, also known as Charms of the Gaels, is a compendium of prayers, hymns, charms, incantations, blessings, folk poems, songs, proverbs, and miscellaneous lore gathered in the Gàidhealtachd regions of Scotland between 1860 and 1909. (Wikipedia)
Alexander Carmichael was a civil servant and exciseman whose work took him throughout the Highlands and Islands, and he spent those decades sitting with people in their homes, listening, and recording what was being said and sung in a tradition that was already beginning to disappear.
The Original Six-Volume Set
Carmichael himself was responsible for the first two volumes, published in 1900. His daughter Ella re-edited them in 1928.
Further volumes were edited by his grandson James Carmichael Watson and published in 1940 and 1941. A fifth volume was edited by Professor Angus Matheson in 1954, and the series was completed in 1971 with a sixth volume containing a lengthy glossary and indices.( Wikipedia)