THE PHILOSOPHY OF LUCRETIUS. The peculiarity of the poem of Lucretius, that which makes it unique in literature, is the fact that it is a long sustained argument in verse. The prosaic title of the poem, 'De rerum natura,'--a translation of the Greek [Greek: peri physeos],--indicates that the method of exposition was adopted, not primarily with the view of affecting the imagination, but with that of communicating truth in a reasoned system. In the lines, in which the poet most confidently asserts his genius, he professes to fulfil the three distinct offices of a philosophical teacher, a moral reformer, and a poet,-- Primum quod magnis doceo de rebus et artis Religionum animum nodis exsolvere pergo, Deinde quod obscura de re tam lucida pango Carmina, musaeo contingens cuncta lepore[1]. We have, accordingly, to examine the poem in three different aspects:-- I. as the exposition of a system of speculative philosophy. II. as an attempt to emancipate and reform human life. III. as a work of poetical art and genius. But these three aspects, though they may be considered separately, are not really independent of one another. The speculative ideas on which the system of philosophy is ultimately based impart confidence and elevation to the moral teaching, and new meaning and imaginative grandeur to the interpretation of Nature and of human life, on which the permanent value of the poem depends. Thus, although the philosophical argument, which forms as it were the skeleton of the work, is in many places barren and uninteresting, yet it is necessary to master it before we can form a true estimate of the personality of the poet, of the main passion and labour of his life, of the full meaning of his thought, and the full compass of his poetic genius. Moreover, the study of the argument is interesting on its own account. In no other work are the strength and the weakness of ancient physical philosophy so apparent. If the poem of Lucretius adds nothing to the knowledge of scientific facts, it throws a powerful light on one phase of the ancient mind. It is a witness of the eager imagination and of the searching thought of that early time, which endeavoured, by the force of individual thinkers and the intuitions of genius, to solve a problem which is perhaps beyond the reach of the human faculties, and to explain, at a single glance, secrets of Nature which have only slowly been revealed to the patient labours and combined investigations of many generations of enquirers. I.--EXAMINATION OF THE ARGUMENT.