Letter from David Brewster, Allerly, Melrose, to [John Hall] Gladstone Would like Gladstone's views on the work of Bunsen and Kirchhoff. His and Gladstone's joint paper has been sent to the editor. Brewster is thinking of publishing experiments performed in 1842 on lines produced by the combustion of salts and minerals. Mentions likely opposition to Gladstone's report from Trinity House. 5 June 1861