In the Burgess Roll of Glasgow:
John Aitchison, merchant, Burgess and Guild Brother, as serving apprentice with Messrs Moor, Carrick and Company, merchants, B. and G.B. 8th September 1796.
Walter Aitchison, merchant, Burgess and Guild Brother, as serving apprentice with Robertson, McCulloch and Company, merchants, B. and G.B. 11th August 1801.