Collection of 40 letters, mainly addressed to McColloch. Writers include: Lord Ashley [Anthony Ashley-Cooper, later Earl of Shaftesbury], Sir Francis Baring, Adam Black, Henry Brougham [later Baron Brougham & Vaux], the Earl of Durham [John Lambton], Sir James Graham, François Guizot, William G Hayter, David Irving, Francis Jeffrey, Sir George Cornewall Lewis, Thomas Frankland Lewis, Thomas Longman [publisher], Samuel Jones Loyd [later Baron Overstone], James Mill, Thomas Spring Rice [Baron Monteagle], Lord John Russell, the Duke of Somerset [Edward Adolphus Seymour, later St Maur], Earl Stanhope [Philip Henry Stanhope], William Tait [?publisher], R Torrens, George Villiers [later Earl of Buckingham], and Sylvain Van de Weyer.
Many letters include autograph signatures. With descriptions, transcripts and comments by Professor H S Foxwell.