going down on someone in 1859

[George Thompson]

Mary Barrett [a whore] . . . is not content with driving her
illegitimate trade, but must needs "go down" occasionally on
her "lovers."  Last week while a drunken fool was engaged in surveying
three dollars worth of beauty, she "wend down" and got his pocket-book
containing about forty dollars.
California Police Gazette, January 23, 1859, p. 2, col. 4

GAT

George A. Thompson
Author of A Documentary History of "The African Theatre", Northwestern
Univ. Pr., 1998, but nothing much lately.