The two privileged classes are the Druids and the Knights. The Druids officiate at the worship of the gods, regulate public and private sacrifices, and give rulings on all religious questions. Large numbers of young men flock to them for instruction, and they are held in great honour by the people. They act as judges in practically all disputes, whether between tribes or between individuals; when any crime is committed, or a murder takes place, or a dispute arises about an inherit-ance or a boundary, it is they who adjudicate the matter and appoint the compensation to be paid and received by the parties concerned. Any individual or tribe failing to accept their award is banned from taking part in sacrifice - the heaviest punishment that can be inflicted upon a Gaul. Those who are laid under such a ban are regarded as impious criminals. Everyone shuns them and avoids going near or speaking to them, for fear of taking some harm by contact with what is unclean; if they appear as plaintiffs, justice is denied them, and they are excluded from a share in any honour. All the Druids are under one head, whom they hold in the highst respect. On his death, if any one of the rest is of outstanding merit, he succeeds to the vacant place; if several have equal claims, the Druids usually decide the election by voting, though sometimes they actually fight it out.