For, be it noted, Bill has assaulted an old and starving woman also; and for this worse offence he feels no remorse whatever, because she makes it clear that her malice is as great as his own. "Let her have the law of me, as she said she would," says Bill: "what I done to her is no more on what you might call my conscience than sticking a pig." This shows a perfectly natural and wholesome state of mind on his part. The old woman, like the law she threatens him with, is perfectly ready to play the game of retaliation with him: to rob him if he steals, to flog him if he strikes, to murder him if he kills. By example and precept the law and public opinion teach him to impose his will on others by anger, violence, and cruelty, and to wipe off the moral score by punishment. That is sound Crosstianity. But this Crosstianity has got entangled with something which Barbara calls Christianity, and which unexpectedly causes her to refuse to play the hangman's game of Satan casting out Satan. She refuses to prosecute a drunken ruffian; she converses on equal terms with a blackguard whom no lady could be seen speaking to in the public street: in short, she behaves as illegally and unbecomingly as possible under the circumstances. Bill's conscience reacts to this just as naturally as it does to the old woman's threats. He is placed in a position of unbearable moral inferiority, and strives by every means in his power to escape from it, whilst he is still quite ready to meet the abuse of the old woman by attempting to smash a mug on her face. And that is the triumphant justification of Barbara's Christianity as against our system of judicial punishment and the vindictive villain-thrashings and "poetic justice" of the romantic stage. For the credit of literature it must be pointed out that the situation is only partly novel. Victor Hugo long ago gave us the epic of the convict and the bishop's candlesticks, of the Crosstian policeman annihilated by his encounter with the Christian Valjean. But Bill Walker is not, like Valjean, romantically changed from a demon into an angel. There are millions of Bill Walkers in all classes of society to-day; and the point which I, as a professor of natural psychology, desire to demonstrate, is that Bill, without any change in his character whatsoever, will react one way to one sort of treatment and another way to another.