Lucretius twists the ancient veil of Isis, steeped in the waters of darkness, and expresses out of it sometimes in torrents, sometimes drop by drop, a sombre poetry. The boundless is in Lucretius. At times there passes a powerful spondaic verse almost terrible, and full of shadow: "Circum se foliis ac frondibus involventes." Here and there a vast image is sketched in the forest,--"Tunc Venus in sylvis jungebat corpora amantum;" and the forest is Nature. These verses are impossible with Virgil. Lucretius turns his back on humanity, and looks fixedly on the Enigma. Lucretius's spirit, working to the very deeps, is placed between this reality, the atom, and this impossibility, the vacuum; by turns attracted by these two precipices. Religious when he contemplates the atom, sceptical when he sees the void; thence his two aspects, equally profound, whether he denies, whether he affirms. One day this traveller commits suicide. This is his last departure. He puts himself _en route_ for Death. He departs to see. He has embarked successively on all the pinnaces,--on the galley of Trevirium for Sanastrea in Macedonia; on the trireme of Carystus for Metapon in Greece; on the skiff of Cyllenus for the island of Samothrace; on the sandal of Samothrace for Naxos, where is Bacchus; on the _ceroscaph_ of Naxos for Syria; on the vessel of Syria for Egypt, and on the ship of the Red Sea for India. It remains for him to make one voyage. He is curious about the dark country; he takes his passage on the coffin, and himself unfastening the mooring, pushes with foot into space this dark vessel that floats on the unknown wave.