Autograph Letter Signed to Dr Thompson, Edinburgh.

12mo, 2 pp. Good, on lightly-aged paper, with thin strip of black mount adhering at head on reverse (not affecting text). He has received Thompson's note 'intimating to me the necessity under which the Revd Mr Lewis and the Committee of Union Chapel find themselves reluctantly placed, to refuse our deputation an opportunity of pleading the Cause of our Society on the present occasion'. Refers to the 'great liberality of the Members of the Union Chapel' and 'their attachment to the good Cause'. He deplores the fact that they are 'unable to allow us even a week evening during our Stay in London'. Thomson was elder brother of scientist Thomas Thomson (1773-1852).