by the fact, by the overwhelming evidence of thing after thing, raining down upon us, all bearing witness with one voice to the nature of the world.

Suppose, however,—and it is a tenable supposition,—that Lucretius is quite wrong in his science, and that there is no space, no substance, and no nature. His poem would then lose its pertinence to our lives and personal convictions; it would not lose its imaginative grandeur. We could still conceive a world composed as he describes. Fancy what emotions those who lived in such a world would have felt on the day when a Democritus or a Lucretius revealed to them their actual situation. How great the blindness or the madness dissipated, and how wonderful the vision gained! How clear the future, how intelligible the past, how marvellous the swarming atoms, in their unintentional, perpetual fertility! What the sky is to our eyes on a starry night, that every nook and cranny of nature would resemble, with here and there the tentative smile of life playing about those constellations. Surely that universe, for those who lived in it, would have had its poetry. It would have been the poetry of naturalism. Lucretius, thinking he lived in such a world, heard the music of it, and wrote it down.

And yet, when he set himself to make his poem out of the system of Epicurus, the greatness of that task seems to have overwhelmed him. He was to unfold for the first time, in sonorous but unwieldy Latin, the birth and nature of all things, as Greek subtlety had discerned them. He was to dispel superstition, to refute antagonists, to lay the sure foundations of science and of wisdom, to summon mankind compellingly from its cruel passions and follies to a life of simplicity and peace. He was himself combative and distracted enough—as it is often our troubles, more than our attainments, that determine our ideals. Yet in heralding the advent of human happiness, and in painting that of the gods, he was to attain his own, soaring upon the strong wings of his hexameters into an ecstasy of contemplation and enthusiasm. When it is so great an emotion to read these verses, what must it have been to compose them? Yet could he succeed? Could such great things fall to his lot? Yes, they might, if only the creative forces of nature, always infinite and always at hand, could pass into his brain and into his spirit; if only the seeds of corruption and madness, which were always coursing through the air, could be blown back for a moment; and if the din of civil conflicts could be suspended while he thought and wrote. To a fortunate conjunction of atoms, a child owes his first being. To a propitious season and atmosphere, a poet owes his inspiration and his success. Conscious that his undertaking hangs upon these chance conjunctions, Lucretius begins by invoking the powers he is about to describe, that they may give him breath and genius enough to describe them. And at once these powers send him a happy inspiration, perhaps a happy reminiscence of Empedocles. There are two great perspectives which the moralist may distinguish in the universal drift of atoms,-a creative movement, producing what the moralist values, and a destructive movement, abolishing the same. Lucretius knows very well that this distinction is moral only, or as people now say, subjective. No one else has pointed out so often and so clearly as he that nothing arises in this world not helped to life by the death of some other thing;[3] so that the destructive movement creates and the creative movement destroys. Yet from the point of view of any particular life or interest, the distinction between a creative force and a destructive force is real and all-important. To make it is not to deny the mechanical structure of nature, but only to show how this mechanical structure is fruitful morally, how the outlying parts of it are friendly or hostile to me or to you, its local and living products.

This double colouring of things is supremely interesting to the philosopher; so much so that before his physical science has reached the mechanical stage, he will doubtless regard the double aspect which things present to him as a dual principle in these things themselves. So Empedocles had spoken of Love and Strife as two forces which respectively gathered and disrupted the elements, so as to carry on between them the Penelope's labour of the world, the one perpetually weaving fresh forms of life, and the other perpetually undoing them.[4]

It needed but a slight concession to traditional rhetoric in order to exchange these names, Love and Strife, which designated divine powers in Empedocles, into the names of Venus and Mars, which designated the same influences in Roman mythology. The Mars and Venus of Lucretius are not moral forces, incompatible with the mechanism of atoms; they are this mechanism itself, in so far as it now produces and now destroys life, or any precious enterprise, like this of Lucretius in composing his saving poem. Mars and Venus, linked in each other's arms, rule the universe together; nothing arises save by the death of some other thing. Yet when what arises is happier in itself, or more congenial to us, than what is destroyed, the poet says that Venus prevails, that she woos her captive lover to suspend his unprofitable raging. At such times it is spring on earth; the storms recede (I paraphrase the opening passage),[5] the fields are covered with flowers, the sunshine floods the serene sky, and all the tribes of animals feel the mighty impulse of Venus in their hearts.

The corn ripens in the plains, and even the sea bears in safety the fleets that traverse it.

Not least, however, of these works of Venus is the Roman people. Never was the formative power of nature better illustrated than in the vitality of this race, which conquered so many other races, or than in its assimilative power, which civilized and pacified them. Legend had made Venus the mother of Aeneas, and Aeneas the progenitor of the Romans. Lucretius seizes on this happy accident and identifies the Venus of fable with the true Venus, the propitious power in all nature, of which Rome was indeed a crowning work. But the poet's work, also, if it is to be accomplished worthily, must look to the same propitious movement for its happy issue and for its power to persuade. Venus must be the patron of his art and philosophy. She must keep Memmius from the wars, that he may read, and be weaned from frivolous ambitions; and she must stop the tumult of constant sedition, that Lucretius may lend his undivided mind to the precepts of Epicurus, and his whole heart to a sublime friendship, which prompts him to devote to intense study all the watches of the starry night, plotting the course of each invisible atom, and mounting almost to the seat of the gods.[6]

This impersonation in the figure of Venus of whatever makes for life would not be legitimate—it would really contradict a mechanical view of nature—if it were not balanced by a figure representing the opposite tendency, the no less universal tendency towards death.

The Mars of the opening passage, subdued for a moment by the blandishments of love, is raging in all the rest of the poem in his irrepressible fury. These are the two sides of every transmutation, that in creating, one thing destroys another; and this transmutation being perpetual,—nothing being