THE Book of Job is among the other Old Testament Books both a philosophical riddle and a historical riddle. Controversy has long raged about which parts of this epic belong to its original scheme and which are interpolations of considerably later date. The doctors disagree, as it is the business of doctors to do; but upon the whole the trend of investigation has always been in the direction of maintaining that the parts interpolated, if any, were the prose prologue and epilogue and possibly the speech of the young man who comes in with an apology at the end. This work contains Chesterton's assumptions and thoughts on this mysterious scripture.