CONTENTS. IX 



CHAPTER XVI. 



PAGB 



Rules . . . .' 193 



CHAPTER XVII. 

 Postal and Impost Regulations ..... 215 



CHAPTER XVIII. 

 The Weather 220 



CHAPTER XIX. 

 Literature 229 



CHAPTER XX. 

 Names, Histories, and Classification .... 241 



CHAPTER XXI. 

 Elements, Symbols, and Analyses .... 259 



CHAPTER XXII. 

 Glossary 277 



INDEX 293 



