Usage of non-verbal expressions in the trilogy of "an American tragedy" (by T. Dreiser)

This article is about the usage of non-verbal expressions in the trilogy of "An American Tragedy" which is written by Theodor Dreiser. In written passage they can be expressed by some verbs as flowing, winking, nodding, winking, shaking, smiling and so on. But at the same time that he had addressed Roberta, and she had smiled back at him, Ruza Nikoforitch, who was working two tables away, nudged the girl working next her, and without any one noting it, first winked, then indicated with a slight movement of the head both Clyde and Roberta. Her friend was to watch them. And after Clyde had gone away and Roberta was working as before, she