And the unattractiveness of much of his theme is not diminished when the real discoveries of science have shewn how illusory are his processes of investigation, and how false are many of his conclusions. He has made his poetry ancillary to his science, instead of compelling, as Virgil, Dante, and Milton have done, a subject, susceptible of purely artistic treatment, to assimilate the stores of his knowledge. His theme—'maiestas cognita rerum,'—is too vast and complex to be brought within the compass and proportions of a single work of art. The processes of minute observation and reasoning employed in establishing his conclusions are alien from the movement of the imagination. The connecting links of the argument are suggestive of the labour of the workman, not of the finished perfection of the work. And while some of the ideas of science may be so applied to the interpretation of the outward world, as to act on the imaginative emotions with greater power than any mere description of the forms and colours of external things, yet the pleasure with which processes of investigation are pursued is quite distinct from the pleasure derived from poetic intuition into the secret life of Nature and man. If it be the condition of a great poem to produce the purest and noblest pleasure by its whole conception and execution, the poem of Lucretius fails to satisfy this condition. It is, in spite of its design and proportions,—in spite of the fact that long parts of the work neither interest the feelings nor satisfy the reason, that the poem still speaks with impressive power to the modern world.
And while the whole conception of the work, as regards both matter and method of treatment, necessarily involves a large interfusion of prosaic materials with the finer product of his genius, it must be added that there is considerable inequality of execution even in its more inspired passages. A few consecutive passages show indeed the finest sense of harmony, and are finished in a style not much inferior to that of Virgil. Such, for instance, are the opening lines:—
Aeneadum genetrix, hominum divomque voluptas, etc.;—
and again the lines in the introduction to Book iii:—
Apparet divum numen sedesque quietae, etc.
But long passages seem rather to revert to the roughness of Ennius than to approach the smooth and varied cadences of Virgil. Though the imaginative effect of single expressions is generally more forcible than in any Latin poet, yet the composition of long paragraphs is apt to overflow into prosaic detail, or to display the qualities of logical consecutiveness or close adherence to fact rather than those of skilled accomplishment and conformity with the principles of beauty. In common with the older race of Roman poets he exhibits that straining after verbal effects by means of alliteration, assonances, asyndeta, etc., which marks the ruder stages of literary development. The Latin language, although beginning to feel the quickening of a new life, had not yet been formed into its more exquisite modulations, nor learned the power of suggesting delicate shades of meaning and the new strength derivable from the reserved use of its resources. All these causes,—the vast and miscellaneous range, and the abstruse character of his subject, the dryness and futility of much of the argument, the frequent subordination of poetry to science, the inadequacy of the Latin language as a vehicle of thought and its imperfect development as an organ of poetry,—prevented the poem from ever obtaining great popularity in ancient times, and have denied to it in modern times anything like the large influence which has been enjoyed in different ages and countries by Virgil, Horace, and Ovid. Even the more ardent admirers of the poem are tempted to pass from one to another of the higher ranges and more commanding summits, which swell gradually or rise abruptly out of the general level over which he leads them, rather than to follow him through all the windings of his argument.
Yet it is only after the poem has been mastered in its details that we realise its full effect on the imagination. It is only then that we understand the complete greatness of the man, as a thinker, a teacher, and a poet. The most familiar beauties reveal a deeper meaning when they are seen to be not mere resting places in the toilsome march of his argument, but rather commanding positions, successively reached, from which the widest contemplative views of the realms of Nature and human life are laid open to us. As we follow closely in his footsteps, through all his processes of observation, analysis, and reasoning, we feel, that he too, like the older Greeks, is borne along by a strong enthusiasm,—the philosophical ἔρως of Plato,—different from, but akin to, the impulses of poetry. That marvellous intensity of feeling in conjunction with the operations of the intellect, which the Greeks regarded as a kind of divine possession, and which Lucretius, by the use of such phrases as 'divinitus invenientes,' ascribes to the earliest enquirers, animates all his interpretation of the facts and laws of Nature. The speculative passion imparts life to the argumentative processes which are addressed to the understanding, while it adds a fresher glory or more impressive solemnity to those aspects of the subject by which the imagination is most powerfully moved.
Again, although his rhythm, even at its best, falls far short of the intricate harmony and variety of Virgil, and, in its more level passages, scarcely aims at pleasing the ear at all, yet there is a kind of grandeur and dignity even in its monotony, varied, as that is, by deeper and more majestic tones whenever his spirit is stirred by impulses of awe, wonder, and delight. There is always a sense of life and onward movement in the flow of his verse. Often there is a kind of cumulative force revealing a more powerful emotion of heart and imagination as his thoughts and images press on one another in close and ordered sequence. Thus, for instance, the effect of the lines describing the religious impressions produced on the early inhabitants of the world by the grand and awful aspects of Nature, depends, not on any harmonious variation of sounds, but on the swelling and culminating power with which the whole passage breaks on the ear,—