Read it through once

This was the last feather. Tom had managed to endure everything else, but to have to remain publicly and permanently under such an obligation as this to a nigger, and to this nigger of all niggers--this was too much. He heaped insults upon Chambers for "pretending" to think he was in earnest in calling for help, and said that anybody but a block-headed nigger would have known he was funning and left him alone.