THE Devil was known to our ancestors as the -L Father of Lies, and lying has always been regarded by the moralists as one of the cardinal vices on which others turn. On the other hand, lying may be vigorously defended from the social or the worldly points of view, and some of the most attractive characters seem incapable of telling the literal truth. Professor Cock holds the Chair of Education and Philosophy at University College, Southampton, and he is qualified to deal with this intriguing subject in an authoritatively philosophical vein.