Read it through once

The new negroes gave Roxy no trouble, of course. The master gave her none, for one of his speculations was in jeopardy, and his mind was so occupied that he hardly saw the children when he looked at them, and all Roxy had to do was to get them both into a gale of laughter when he came about; then their faces were mainly cavities exposing gums, and he was gone again before the spasm passed and the little creatures resumed a human aspect.