6THE INFINITY OF THE UNIVERSE
17THE WORLD IS NOT ETERNAL
7ATOMIC MOTIONS
18ORIGINS OF VEGETABLE AND ANIMAL LIFE
8ATOMIC FORMS AND THEIR COMBINATIONS
19ORIGINS AND SAVAGE PERIOD OF MANKIND
9INFINITE WORLDS
20BEGINNINGS OF CIVILIZATION
10NATURE AND COMPOSITION OF THE MIND
21GREAT METEOROLOGICAL PHENOMENA, ETC.
11THE SOUL IS MORTAL
22THE PLAGUE ATHENS