break occurs; experience alone has been the guide of life. If we ask, however, whether he had any idea of _progress_ as we understand it, we must answer no. He did not believe in the perfectibility of man, or in the ultimate prevalence of virtue in the world. The last Book tries to show the natural origin of the rarer and more gigantic physical phenomena, thunderstorms, volcanoes, earthquakes, pestilence, &c. and terminates with a long description of the plague of Athens, in which we trace many imitations of Thucydides. This book is obviously unfinished; but the aim of the work may be said to be so far complete that nowhere is the central object lost sight of, viz., to expel the belief in divine interventions, and to save mankind from all fear of the supernatural. The value of the poem to us consists not in its contributions to science but in its intensity of poetic feeling. None but a student will read through the disquisitions on atoms and void. All who love poetry will feel the charm of the digressions and introductions. These, which are sufficiently numerous, are either resting-places in the process of proof, when the writer pauses to reflect, or bursts of eloquent appeal which his earnestness cannot repress. Of the first kind are the account of spring in Book I. and the enumeration of female attractions in Book IV.; of the second, are the sacrifice of Iphigenia, [68] the tribute to Empedocles and Epicurus, [69] the description of himself as a solitary wanderer among trackless haunts of the Muses, [70] the attack on ambition and luxury, [71] the pathetic description of the cow bereft of her calf, [72] the indignant remonstrance with the man who fears to die. [73] In these, as in innumerable single touches, the poet of original genius is revealed. Virgil often works by allusion: Lucretius never does. All his effects are gained by the direct presentation of a distinct image. He has in a high degree the "seeing eye," which needs only a steady hand to body forth its visions. Take the picture of Mars in love, yielding to Venus's prayer for peace. [74] What can be more truly statuesque? "Belli fera moenera Mavors Armipotens regit, in gremium qui saepe tuum se Reiicit aeterno devictus volnere amoris: Atque ita suspiciens tereti cervice reposta Pascit amore avidos inhians in te, dea, visus, Eque tuo pendet resupini spiritus ore. Hunc tu diva tuo recubantem corpore sancto Circumfusa super suavis ex ore loquellas Funde petens placidam Romanis, incluta, pacem." Or, again, of nature's freedom: "Libera continuo dominis privata superbis." Who can fail in this to catch the tones of the Republic? Again, take his description of the transmission of existence, "Et quasi cursores vitai; lampada tradunt;" or of the helplessness of medicine in time of plague, "Mussabat tacito medicina timore."