This is a bundle of notebooks (or jotters) in which Mackinnon made notes for his volume on the History of Argyll and the Isles. Each notebook represents a section of his volume; the title of each section being on the front cover of its notebook. Some sections may have been earlier drafts, or were re-written, so more than one notebook may have the same section number,or no section number at all. The sections are listed below:

I. Early inhabitants

II. (1) Pre-Dalriadic; and (2) Dalriadic immigration and occupation [until] Norse invasion

III. The Columban Church

II. The Dalriads

IV. The companions and followers of St Columba

Language and literature [no section number]

III. The Norse invasion and occupation of the Hebrides

II. The Dalriads

The Dalriads [no section number]

IV. The Norse invasion and occupation of the Hebrides: Effects of the Norse invasion [two notebooks]

The Campbells of Argyle [no section number]

V. The Lords of the Isles

I. Early inhabitants: Pre-Dalriadic

V. The Columban Church