On the Nature of Things

10 - Book 4, pt 1 - Theory of image. Vision is produced by the impact of images on the eye. Senses may be trusted; false opinions arise from false rea...

11 - Book 4, pt 2 - Other senses: sound, taste and odor. Imagination and thought are produced by means of images. The nature of dreams. The use of the...

12 - Book 4, pt 3 - Motion in animals and motion in images. Sleep and causes of dreams. Love and desire and their influence.

13 - Book 5, pt 1 - Praise of Epicurus. The world is not eternal. Heavenly bodies. The world had a beginning and will have an end.

14 - Book 5, pt 2 - Cosmogony according to Epicurus. Causes of the motions of heaven. The magnitude of heavenly bodies and causes of their phenomena: ...

15 - Book 5, pt 3 - The rudeness of the early life of men. The invention of speech.The discovery of fire, the progress of society. The rise of religio...

16 - Book 6, pt 1 - Panegyric on Athens. Meteoric appearances in the heaven. Causes of shooting stars, lightning, thunderbolts. Ridicule of those who ...

17 - Book 6, pt. 2 - Origin of water-spouts, clouds, rain, rainbow, earthquakes and other phenomena. About the seas and volcanoes. About rivers and la...

18 - Book 6, pt. 3 - About the temperature of waters. About magnets and why metals are attracted to them. About the origin and cause of diseases. Desc...