xvi CONTENTS. 



CHAPTER XX. 



SCIENCE OF THE SEVENTEENTH CENTURY (CONTINUED). 



PAGE 



Newton's Discovery of the Dispersion of Light Traces the 

 amount of Refraction of each of the Coloured Rays Makes a 

 Rotating Disc turning the colours of the Spectrum into White 

 Light Reason why all Light passing through glass is not 

 Coloured Mr. Chester More Hall discovers the Difference of 

 Dispersive Power in Flint and Crown Glass Newton's Papers 

 destroyed bv his pet dog Last years of Newton's life . .164 



CHAPTER XXI. 



SCIENCE OF THE SEVENTEENTH CENTURY (CONTINUED). 



Roemer measures the Velocity of Light Newton's Corpuscular 

 Theory of Light Undulatory or Wave Theory proposed by 

 Huyghens Invention of Cycloidal Pendulums by Huyghens 

 Discovery of Saturn's Ring Sound caused by Vibration of Air 

 Light by Vibration of Ether Reasons why we see Light 

 Reflection of Waves of Light Cause of Colour Refraction 

 explained by the Undulatory Theory Mr. Tylor's Illustration 

 of Refraction Double Refraction explained by Huyghens 

 Polarisation of Light not understood till the nineteenth century . 1 72 



CHAPTER XXII. 

 SUMMARY OF THE SCIENCE OF THE SEVENTEENTH CENTURY 182 



CHAPTER XXIII. 



SCIENCE OF THE EIGHTEENTH CENTURY. 



Great spread of Science in the Eighteenth Century Advance of 

 the Sciences relating to Living Beings Foundation of Leyden 

 University in 1574 Boerhaave, Professor of Medicine at Ley- 

 den, 1701 Foundation of Organic Chemistry by Boerhaave 

 Influence of Boerhaave upon the study of Medicine Belief of 

 the Alchemists in ' Vital Fluids ' Boerhaave's Experiments on 

 the Juices of Plants Dr. Hales's Experiments on Plants Boer- 

 haave's Analyses of Milk, Blood, &c. Great popularity of his 

 Chemical Lectures . . . . . . . . .189 



