From the text:
"Tom was twenty-five years of age; he was married with three children; he had been in trouble with the law before: he once received thirty days for disorderly conduct." - Chapter 19
"Tom was a black-velvet Negro, not shiny, but soft black velvet. The whites of his eyes shone in his face, and when he spoke we saw flashes of his teeth. If he had been whole, he would have been a fine specimen of a man." - chapter 19
He also has one useless arm.
"Thomas Robinson reached around, ran his fingers under his left arm and lifted it. He guided his arm to the Bible and his rubber-like left hand sought contact with the black binding. As he raised his right hand, the useless one slipped off the Bible and hit the clerk’s table." Chapter 19
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