The arrangement and original binding order of the collection was by Campbell, who numbered his `M.S. West Highland Tales` from I to XVIII, corresponding to the numeration Adv.MSS.50.1.1-50.1.14, 50.2.1-50.2.4. The series of original tales and editorial material was continued from 1870 as `Gaelic M.S.`, XIX-XXII, now Adv.MSS.50.2.5-50.2.8.
The order of the material does not always follow the final publication order in ‘Popular Tales of the West Highlands’.
For conservation reasons some of Campbell`s volumes have been taken down and boxed in fascicles. Of these volumes, many are split into more than one box, with some of the individual tales split between two boxes. In some cases, the original boards and endpapers have been retained.