His poem
De rerum natura (usually translated as "On the Nature of Things" or "On the Nature of the Universe") transmits the ideas of
Epicureanism, which includes
atomism and
cosmology. Lucretius was the first writer known to introduce Roman readers to Epicurean philosophy. The poem, written in some 7,400
dactylic hexameters, is divided into six untitled books, and explores Epicurean physics through richly poetic language and
metaphors. Lucretius presents the principles of
atomism, the nature of the mind and
soul, explanations of sensation and thought, the development of the world and its
phenomena, and explains a variety of celestial and terrestrial
phenomena. The universe described in the poem operates according to these physical principles, guided by
fortuna, "chance", and not the
divine intervention of the
traditional Roman deities and the religious explanations of the natural world. Within this work, Lucretius makes reference to the cultural and
technological development of humans in his use of available materials, tools, and weapons through prehistory to Lucretius's own time. He specifies the
earliest weapons as hands, nails, and teeth. These were followed by stones, branches, and fire (once humans could kindle and control it). He then refers to "tough iron" and copper in that order, but goes on to say that copper was the primary means of tilling the soil and the basis of weaponry until, "by slow degrees", the iron sword became predominant (it still was in his day) and "the bronze sickle fell into disrepute" as iron ploughs were introduced. He had earlier envisaged a pre-technological, pre-literary kind of human whose life was lived "in the fashion of wild beasts roaming at large". From this beginning, he theorised, there followed the development in turn of crude huts, use and kindling of fire, clothing, language, family, and
city-states. He believed that smelting of metal, and perhaps too, the firing of pottery, was discovered by accident: for example, the result of a forest fire. He does specify, however, that the use of copper followed the use of stones and branches and preceded the use of iron. File:T. Lucretii Cari De rerum natura.tif|
De rerum natura (1570) File:Carus-3.jpg|alt=|1754 copy of
De rerum natura File:Carus-4.jpg|alt=|Frontispiece of a 1754 copy of
De rerum natura File:Carus-1.jpg|alt=|1683 English translation of
De rerum natura File:Carus-2.jpg|alt=|Title page of a 1683 English translation of
De rerum natura Reception In a letter by
Cicero to his brother
Quintus in February 54 BC, Cicero said: "The poems of Lucretius are as you write: they exhibit many flashes of
genius, and yet show great mastership." In the work of another author in late Republican Rome,
Virgil writes in the second book of his
Georgics, apparently referring to Lucretius, "Happy is he who has discovered the causes of things and has cast beneath his feet all fears, unavoidable fate, and the din of the devouring Underworld." ==Natural philosophy==