Autograph letter signed (within the text).
8vo. 1 p. on bifolium.
To Mrs. Erskine, possibly the wife of the Scottish orientalist and historian William Erskine: "Mr. Mendelssohn presents his Compts. to Mrs. Erskine & regrets most sincerely not to be able to accept of Mrs. Erskine's very kind invitation; as he must leave London already next week he is not sure whether he will be able to thank Mrs. Erskine in person for her kind note, but he hopes to find an opportunity of doing so [...]".
Mendelssohn was known to have been in London in April 1847, to hear Jenny Lind sing in Meyerbeer's "Robert le Diable". Mendelssohn greatly admired Lind and in the 1840s she became a protégée - it was rumoured that in 1847 he had written to her to suggest an elopement, though she was married at the time.
On laid paper watermarked "J. WHATMAN", with two early horizontal folds, in very good condition.
Though not formally signed, the use of his name at the beginning is effectively a signature.