(5) The thought, also, of the infinite subtlety of combination in the elements and forces of the world acts powerfully on his imagination. The individuality of things depends on the fact that no two are composed of exactly the same elements, combined in the same way. The infinity of the elements, the immensity of the spaces in which they meet, and the infinite possibilities in their modes of combination result in the endless variety of beauty and wonder which the world presents to the eye. The epithet 'daedala,' by which this subtlety is expressed is applied not only to Nature, but to the earth as the sphere in which the elements are most largely mixed, and the creative forces most powerfully active. The varied loveliness of the world,--the 'varii lepores,' by which the eye is gratified and relieved,--are the result of the variety in the elements and the infinite subtlety in their modes of combination. Their invisibility and inscrutable action enhance the imaginative sense of the power and beauty resulting from these causes. (6) The abstract properties of the atoms, discussed in the first two books, so far from being arbitrary assumptions, without any relation to actual existence, are thus found to be the conditions which explain the order, life, immensity, individuality, and subtlety manifested in the universe. These conceptions, which bridge the chasm between the particles of lifeless matter and the living world, unite in the more general conception of Nature. What then is involved in this conception--the dominant conception of the poem in its philosophical as well as its imaginative aspects? Something more than the subsidiary conceptions mentioned above. There is, in the first place, all that is involved in the unity of an organic whole. But to this whole the imagination of the poet seems, in some passages, to attach attributes scarcely reconcileable with the mechanical principles of his philosophy. In emancipating himself from the religious traditions of antiquity, Lucretius did not altogether escape from the power of an idea, so deeply rooted in the thought of past ages, as to seem to be an integral element of human consciousness. It is against the limitations which the ancient mythology imposed on the idea of Divine agency, rather than against the idea itself, as it is understood in modern times, that his philosophy protests. To Nature his imagination attributes not only life, but creative and regulative power. There would be more truth in calling this conception pantheistic than atheistic. But the sense of will, freedom, individual life, is so strong in Lucretius, that we think of the 'natura daedala rerum' rather as a personal power, with attributes in some respects analogous to those of man, than as a being in whose existence all other life is merged. Though this figurative attribution of personal qualities to great natural forces cannot be pressed as evidence of philosophical