Undated letters which could not be placed in order on internal evidence have, so far as was possible, been left in the positions in which they came to the Library. Lists of F. Mendelssohn Bartholdy's letters are in MS. M. Deneke Mendelssohn d. 18, fols. i-iii.

Here are included 23 letters or parts of letters from F. Mendelssohn Bartholdy. A letter from Cécile to her sister Julie Schunck, Aug 1847, is on fols. 188b-c.