viii CONTENTS 



CHAPTER X 

 PRINCIPLE OF ARCHIMEDES 50 



CHAPTER XI 

 LAW OF FLOATING BODIES - 55 



CHAPTER XII 

 PROPERTIES OF GASES GO 



CHAPTER XIII 



EFFECTS OF HEAT - 71 



CHAPTER XIV 

 MEASUREMENT OF TEMPERATURE - 75 



CHAPTER XV 



RELATION BETWEEN THE VOLUME AND TEMPERATURE OF A 



GIVEN MASS OF GAS -------- 84 



SECTION II. CHEMISTRY 



CHAPTER XVI 



PHYSICAL AND CHEMICAL CHANGES - - 87 



CHAPTER XVII 



OBSERVATION OF THE PROPERTIES OF SUBSTANCES 89 



CHAPTER XVIII 

 EXAMINATION OF COMMON SUBSTANCES 94 



CHAPTER XIX 

 DISTILLATION - 114 



CHAPTER XX 

 CONSTITUTION OF AIR - 118 



