CONTENTS. 



Page 

 LECTURE VI. 



Of Pneumatics - 6l 



LECTURE VII. 

 The Phenomena of the Atmosphere - 78 



LECTURE VIII. 

 Electricity - - - - <# 



LECTURE IX. 



Electrical Phenomena and Galvanism - 10Q 



LECTURE X. 



Light - 129 







LECTURE XI. 

 The Refrangibility of Light . 148 



LECTURE XII. 

 Reflexibility of Light, or Catoptrics \64 



LECTURE XIII. 

 Vision and Optical Glasses - - - 178 



LECTURE XIV. 

 Colours - 199 



LECTURE XV. 

 The Laws of Motion - - - 216 



