No.	Title	Date
1	Extract from letter from Dr James Davidson to Dr Thomas Theodore Thomson, 11 December 1930
2	Letter from Dr James Davidson to Dr Thomas Theodore Thomas, 30 December 1939, Edinburgh
3	Letter from Dr James Davidson to Dr Thomas Theodore Thomson, 11 July 1940, Edinburgh
4	Letter from James Davidson to Francis H. Hawkins, 3 July 1930, Ediburgh