CONTENTS. 15 

 Chapter III. — Inductive Epoch of Hipparchus. 



Page 



Sect. 1. Establishment of the Theory of Epicylea and Eccentrics 145 



Sect. 2. Estimate of the Value of the Theory of Eccentrics and Epicycles. 151 



Sect. 3. Discovery of the Precession of the Equinoxes 155 



Chapter IV. — Sequel ro the Inductive Epoch of 

 Hipparchi 3. 



Sect. 1. Researches which verified the Theory 1">7 



Sect. 2. Researches which did not verify the Theory 159 



Sect. 3. Methods of Observation of the Greek Astronomers 161 



Sect. 4. Period from Hipparchus to Ptolemy 166 



Sect. 5. Measures of the Earth 169 



Sect. 6. Ptolemy's Discovery of Evection 170 



Sect. 7. Conclusion of the History of Greek Astronomy 175 



3. Arabian Astronomy 176 



BOOK IV. 



HISTORY OF PHYSICAL S< LENCE IN THE MIDDLE 



AGES. 



Introduction 185 



Chapter 1. — On the Indistinctness of Ideas of the 



Middle Ages. 



1. Collections of Opinions 187 



2. Indistinctness of Ideas in Mechanics 188 



3. " •' shown in Architecture 191 



1. " " in Astronomy 192 



5. " ' shown by Skeptics [92 



6. Neglect of Physical Reasoning in < Ihristendom 195 



7. Question of Antipodes 195 



8. Intellectual I londition of the Religious Orders 197 



9. Popular Opinions 1 99 



Chapter II. — The Commentator] vi. Spirit of the 



Middle Ages jui 



1. Natural bias to Authority 202 



"J. Character of Commentators 204 



3. Greek Commentators of Aristotle 205 



