The fonds consists of Muir's diary starting in December 1848 as he prepared to leave Scotland for Vancouver Island and continuing until June 5th, 1850. Diary provides details of his voyage to and experiences on Vancouver Island.

The fonds consists of diaries, account books, letter books, a record of place claims 1916-1936, mining receipts and miscellaneous correspondence. The fonds also consists of journals kept while at Fort St. John and Hudson's Hope containing records of trading, supplies, company servants, outside traders, and casual employees. [Also available on microfilm.]