Originally published as part of the Pitt Press Series in 1937, this book provides an overview of Lucretius' philosophical poem 'De rerum natura' intended to clarify the poem's overarching themes to a first-time reader. Sinker also gives a brief running commentary on the individual books as well as more detailed notes on selected passages, which are reproduced in the original Latin. This book will be of use to anyone with an interest in Lucretius or in the historical background of Epicurean philosophy.