DEPARTMENTS OF GOVERNMENT IN A STATE. 347 is to do .whatever his client ought to do, so far as he can form an opinion. The object is not simply in criminal cases to prove or disprove guilt, but to prove or disprove the propri- ety of conviction on the evidence submitted by the prosecut- ing officer. Whether the criminal, if conscious of guilt, ought not to confess it in open court as a matter of duty, is not a jural but a moral question. The jural point is to find out the truth according, to the evidence. In all cases the ad- vocate is bound to abstain from offering any evidence which he knows to be false. But he may, even if he knows from his client that he is guilty, seek to prove that according to the evidence he cannot legally be shown to be guilty, just as the client himself, if arguing his own case, might do accord- ing to the rules of trial. What evidence ought to be admitted in courts, and whether for special reasons certain persons, sustaining a close relation to an accused person, such as a wife, a legal counsellor, or a spiritual adviser, ought not to be called on to bear witness in his case, are matters that do not concern us here. There is a tendency since Bentham's time to introduce a wider range of proof than was before allowed, to receive the testimony of the parties themselves and of others before excluded. We may thus be approaching a time, when, if a man refuses to testify in his own case, it will be presumptive proof that the case is a bad one ; as, when torture of slaves was allowed, to refuse to subject one's own slave to torture when challenged by an adversary, or to admit the adversary's slave, was a point that would be pressed before the judges* by the opposing party. *This was actually pressed at Athens, and in general the testimony of slaves there was more valued than that of free men, which shows the untrustworthiness of a free Greek. Comp. Hudtwalcker von d. Diaeteten, p. 51, and th,e passages there cited in the notes, Demosth. c. Onet, i., p. 874, is especially in point. On the other hand, the fact that slaves who could not hold out against pain would often testify what they thought would free them from torture soonest, was ^urged against witnesses of this sort. Arist. Rhet. ad Alex., chap, xvi., 2.