Macrobius writes, in his commentary on the "Dream of Scipio," "Here, on earth, is the cavern of Dis, the infernal region. The river of oblivion is the wandering of the mind forgetting the majesty of its former life and thinking a residence in the body the only life. Phlegethon is the fires of wrath and desire. Acheron is retributive sadness. Cocytus is wailing tears. Styx is the whirlpool of hatreds. The vulture eternally tearing the liver is the torment of an evil conscience."62 To the ancient Greek in general, death was a sad doom. When he lost a friend, he sighed a melancholy farewell after him to the faded shore of ghosts. Summoned himself, he departed with a lingering look at the sun, and a tearful adieu to the bright day and the green earth. To the Roman, death was a grim reality. To meet it himself he girded up his loins with artificial firmness. But at its ravages among his friends he wailed in anguished abandonment. To his dying vision there was indeed a future; but shapes of distrust and shadow stood upon its disconsolate borders; and, when the prospect had no horror, he still shrank from its poppied gloom. 62 Lib. i. cap. 9, 10. CHAPTER XI. MOHAMMEDAN DOCTRINE OF A FUTURE LIFE. ISLAM has been a mighty power in the earth since the middle of the seventh century. A more energetic and trenchant faith than it was for eight hundred years has not appeared among men. Finally expelled from its startling encampments in Spain and the Archipelago, it still rules with tenacious hold over Turkey, a part of Tartary, Palestine, Persia, Arabia, and large portions of Africa. At this moment, as to adherence and influence, it is subordinate only to the two foremost religious systems in the world, Buddhism and Christianity. The dogmatic structure of Islam as a theology and its practical power as an experimental religion offer a problem of the gravest interest. But we must hasten on to give an exposition of merely those elements in it which are connected with its doctrine of a future life.