A bundle of 17 notebooks, containing notes or scripts for lectures on a lecture series, which seems to have taken place between 1883 and 1884. The following notebooks survive:

'Celtic: A member of the Aryan family' (Item 40a)

'The Celt in Europe' (Item 40b)

'Manners and customs: The military system of the ancient Celts' (Item 40c)

'Manners and customs: The religion of the Celts' (Item 40d)

'Manners and customs: Agriculture, food, drink, and amusements' (Item 40e)

'Manners and customs: Knowledge of medicine' (Item 40f)

'The early inhabitants of Britain' (Item 40g)

'The early inhabitans of Britain: Proof of Iberian race history, language, and tradition' (Item 40h)

'Who were the Picts? [According to] Pinkerton' (Item 40i)

'Who were the Picts? [According to] Chalmers and Skene' (Item 40j)

'History of the Celts in Scotland' (Item 40k)

'The Celtic languages: Grimm's Law' (Item 40l)

'Loanwords: Phonetic changes' (Item 40m)

'Literature: (i) The remains of the literature of Old Gaul; and (ii) General concept(ions) in Celtic literature' (Item 40n)

'Literature: Welsh, Cornish, and Breton' (Item 40o)

'Literature: Manx, Irish, and Gaelic' (Item 40p)

'Literature: The School of Iona' (Item 40q)