West India merchant (Colonial - Caribbean)
This is tentative. The partner might have been a different Alex. Campbell
Dissolution of Alex. & James Campbell & Co. of Copthall Court 30th April 1835; all debtors owing and due to A.G. Milne jun., authorised to receive all consignments. James Campbell, Mungo Campbell, Mungo Campbell jun,. representing the firm of John Campbell sen. & Co. Of Glasgow.
London Gazette 19273 26/5/1835 p. 6 [from Edinburgh Gazette May 15 1835]