CHAPTER V

.--PROGRESS OF THE ARTS IN THE MIDDLE AGES.

1. Art and Science. 239 2. Arabian Science. 242 3. Experimental Philosophy of the Arabians. 243 4. Roger Bacon. 245 5. Architecture of the Middle Ages. 246 6. Treatises on Architecture. 248

## BOOK V.

HISTORY OF FORMAL ASTRONOMY AFTER THE STATIONARY PERIOD.

Introduction. 255

## CHAPTER I .--PRELUDE TO THE INDUCTIVE EPOCH OF COPERNICUS. 257

## CHAPTER II .--INDUCTION OF COPERNICUS. THE HELIOCENTRIC THEORY

ASSERTED ON FORMAL GROUNDS. 262 {17}

##