The purpose of this edition is to demonstrate the quality and interest of book VI: the intellectual curiosity of the analyst of earthquakes, volcanoes and marvellous phenomena, the rhetorical and philosophical powers of a thinker who wants to make his interpretation of Epicureanism both cogent and vivid, the deep humane compassion of the chronicler of the Plague at Athens, the sheer brilliance of the poet whose verse inspired all later writers in the tradition. This edition of the book is designed to make the poem accessible to readers who have not picked up Lucretius before and so the background has been treated as fully as possible in the permitted space.