Southwestern for "afternoon"
If Mr. Harbison owned a slave named Bull, Tom would have spoken of him as "Harbison's Bull," but a son or a dog of that name was "Bull Harbison."
The pretended "compositions" quoted in this chapter are taken without alteration from a volume entitled "Prose and Poetry, by a Western Lady"—but they are exactly and precisely after the schoolgirl pattern, and hence are much happier than any mere imitations could be.