BOOK I. A threefold division of Philosophy, 104. Natural Philosophy: what is Nature? 105. Difference between a principle and an element? 106. What are principles? 106. Opinions of Thales, Anaximander, Anaxagoras, Pythagoras, Heraclitus, Epicurus, Empedocles, Socrates, Plato, Aristotle, Zeno, and others, concerning the origin of things, 107-113. How was the world brought into its present order and condition? 113. Whether the universe is one? 114. Whence the knowledge of a Deity? 115. Different orders and classes of Deities, 117. What is God? is he perfect? is he eternal? does he interfere with human affairs? Opinions of Pythagoras, of Socrates, Aristotle, Epicurus, 118-122. Of geniuses and heroes, 122. Of matter: different opinions, 123. Of ideas, 123. Of causes, 123. Of bodies, 124. Of least things in nature, 125. Of figures, 125. Of colors, 125. Of the division of bodies, 126. Of the mixture of the elements, 126. Of a vacuum, 126. Of place, 127. Of space, 127. Of time, 127. Of the essence and nature of time, 128. Of motion, 128. Of generation and corruption, 128. Of necessity, 129. Of the nature of necessity, 129. Of destiny or fate, 130. Of the nature of fate, 130. Of fortune, 131. Of nature, 131. BOOK II. Of the world, κοσμόϛ, 132. Of the figure of the world, 133. Whether the world be an animal, 133. Whether the world be eternal and incorruptible, 133. Whence does the world receive nutriment? 134. From what element did God begin to raise the fabric of the world? 134. In what form and order was the world composed? 135. What is the cause of the world’s inclination? 136. Of that thing which is beyond the world, and whether it be a vacuum or not, 136. What parts of the world are on the right hand and what parts are on the left? 137. Of heaven, its nature and essence, 137. Into how many circles is the heaven distinguished? the division of heaven, 137. What are the stars made of? 138. Of what figure are the stars? 139. Of the order and place of the stars, 139. Of the motion and circulation of the stars, 140. Whence do the stars receive their light? 140. What are the stars called Dioscuri, or Castor and Pollux? 141. How stars prognosticate: what is the cause of winter and summer? 141. Of the essence of the sun, 141, 142. Of the magnitude of the sun, 142. Of the figure or shape of the sun, 143. Of the turning and returning of the sun, or the summer and winter solstice, 143. Of the eclipses of the sun, 144. Of the essence of the moon, 145. Of the moon’s magnitude and figure, 145. Whence does the moon receive her light? 145. Of eclipses of the moon, 146. Of the phases or aspects of the moon, 147. Of the distance of the moon from the sun, 147. Of the year and the length of the year in the different planets; of the great year, 147.