Scope and arrangement
· To Lady Caroline Lamb, novelist (his sister) : 1 autograph letter signed "W.S.P." : 20 Apr 1823 : (B'ANA 0145) : 4 pages (double sheet) : from Brighton : begins, "I send you all that I can recollect about Salvator Rosa's pictures ..." Mounted in the Wilmerding Album of Caroline Lamb letters. Shelved under *Pforz BT.
· To Sydney Morgan, Lady Morgan, novelist and socialite : 2 letters : -- 1 autograph letter signed "W.S. Ponsonby" : 27 May 1823 : (B'ANA 0146) : 2 pages (double sheet) : from 19, St. James Square : preceded on lettersheet by a one-page letter to Lady Morgan by Caroline Lamb; William's letter begins, "My sister sends me this letter to forward to you, & apologises for not having done your commission earlier ..." -- 1 autograph letter signed "Wm. Ponsonby" : 26 Jan 1828 : (B'ANA 0177) : 1 ¹/₂ pages (double sheet) : [no place] : begins, "The interest which you have felt for my dear Sister, make me anxious that you should not hear from common report the termination of her long & severe suffering ..." Both letters mounted in the Wilmerding Album of Caroline Lamb letters. Shelved under *Pforz BT.