CONTENTS. 21 



Book TV. — Physical Science in the Middle Ages. 



Page 



General Remarks 511 



Progress in the Middle Ages. 



Thomas Aquinas 512 



Roger Bacon 512 



Book V. — Formal Astronomy. 



Prelude to Copernicus. 



Nicolas of Cus 523 



The Copernican Theory. 



The Moon's Rotation 524 



M. Foucalt's Experiments 525 



Sequel to Copernicus. 



English Copernicans 526 



Giordano Bruno 530 



Did Francis Bacon reject the Copernican Doctrine ? 530 



Kepler persecuted 532 



The Papal Edicts against the Copernican System repealed 534 



Book VI. — Mechanics. 



Principles and Problems. 



Significance of Analytical Mechanics 536 



Strength of Materials 538 



Roofs — Arches — Vaults 541 



Book VII. — Physical Astronomy. 



Prelude to Newton. 



The Ancients 544 



Jeremiah Horrox 545 



Newton's Discovery of Gravitation 546 



