I am authorized by the Committee of the AntiSlavery Society, to ask you to name some time for the actual delivery of your address. . . .
I believe that our Treasurer had no opportunity of paying you the twenty dollars proposed. In view of the circumstances (as we rely greatly on the sale of single tickets, in our course), the Committee seem to think themselves authorized in offering you the full price for your first lecture (or attempt at it) and ten dollars more should you come again, — making thirty dollars in all.
SOURCE: Mary Potter Thacher Higginson, Editor, Letters and Journals of Thomas Wentworth Higginson, 1846-1906, p. 59