CHAPTER IV

.--SEQUEL TO THE INDUCTIVE EPOCH OF HIPPARCHUS.

_Sect._ 1. Researches which verified the Theory. 157 _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 _Sect._ 8. Arabian Astronomy. 176

## BOOK IV.

HISTORY OF PHYSICAL SCIENCE IN THE MIDDLE AGES.

Introduction. 185

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