'The Runaway Slave at Pilgrim's Point' (Poetical Works, ii. 192). It was first printed in a collection called The Liberty Bell, for sale at the Boston National Anti-slavery Bazaar of 1848. It was separately printed in England in 1849 as a small pamphlet, which is now a rare bibliographical curiosity.
'Critical Kit-Kats,' by E. Gosse, p. 2 (1896).
A list of the works composing Balzac's Comédie Humaine is attached to this letter for Miss Mitford's benefit.
Miss E.F. Haworth (several letters to whom are given farther on) was an old friend of Robert Browning's, and published a volume of verse in 1847, to which this passage seems to allude.