xlv CONTENTS. 



CHAPTER XIV. 



SCIENCE OF THE SEVENTEENTH CENTURY (CONTINUED). 



Fabncius Aquapendente discovers Valves in the Veins^— Harvey's 

 discovery of the Circulation of the Blood— Discovery of the 

 Vessels which carry nourishment to the Blood — Gaspard Asellius 

 notices the Lacteals — Pecquet discovers the Passage of the fluid 

 to the Heart — RUdbeck discovers the Lymphatics . . .no 



CHAPTER XV. 



SCIENCE OF THE SEVENTEENTH CENTURY (CONTINUED). 



Torricelli discovers the reason of Water rising in a Pump — Uses 

 Mercury to measure the Weight of the Atmosphere— Makes the 

 First Barometer — M. Perrier, at Pascal's suggestion, demon- 

 strates variations in the pressure of the atmosphere — Otto 

 Guericke invents the Air-pump — Working of the Air-pump — 

 Guericke proves the Pressure of the Atmosphere by the experi- 

 ment of the Magdeburg Spheres — He makes the first Electrical 

 Machine — Foundation of Royal Society of London and other 

 Academies of Science 1 16 



CHAPTER XVL 



SCIENCE OF THE SEVENTEENTH CENTURY (CONTINUED). 



Boyle's Law of the Compressibility of Gases — ^This same Law dis- 

 covered independently by Marriotte — Hooke's theory of Air 

 being the cause of Fire — Boyle's experiments with Animals 

 under the Air-pump — ^John Mayow, the greatest Chemist of the 

 Seventeenth Century — His experiments upon the Air used in 

 Combustion — Proves that the same portion is used in Respira- 

 tion — Proves that Air which has lost its Fire-air is Lighter — 

 Mayow's * Fire-air * was Oxygen, and his Lighter Air Nitrogen 

 — He traces out the effect which Fire-air produces in Animals 

 when Breathing . . 128 



