<P> Snow, a detective, enters and finds the cigarette box he is looking for . He assumes Mrs. Jones stole it, and arrests her . Jones, saying he took the box himself, attacks Snow, and a policeman comes in to overpower Jones . </P> <P> Act II, Scene II </P> <P> In the Barthwicks' dining room that evening, Mr. and Mrs. Barthwick and Jack are having dessert . </P> <P> Snow comes in . His report, that Jones says he took the box when he was let in by a drunken Jack, and that Jones had the purse, causes dismay and embarrassment . Snow says Jones should be prosecuted: Barthwick says, as he looks gloomily at Jack, "This prosecution goes very much against the grain with me . I have great sympathy with the poor . In my position I'm bound to recognise the distress there is amongst them ." </P>

What is the role of mr. barthwick in the play the silver box