TABLE OF CONTENTS. 



Xlll 



CHAPTER XVII. 



INSECTS AND ARACHNIDA. 



PAGE 



Number and Variety of Ob- 

 jects afforded by Insects . 

 Structure of Integument 

 Tegumentary Appendages 



Eyes 



Antennae 664 



Mouth .... 

 Circulation of the Blood 

 Respiratory Apparatus . 



CHAPTER XVIII. 



VEETEBRATED ANIMALS. 



CHAPTER XIX. 



APPLICATION OF THE MICROSCOPE TO GEOLOGY. 



Fossilized "Wood, Coal . . 751 

 Fossil Foraminifera, Chalk . 755 

 Organic materials of Rocks . 759 



Structure of Fossil Bones, 



Teeth, <fec 762 



Inorganic materials of Rocks 765 



CHAPTER XX. 



INORGANIC OR MINERAL KINGDOM.— POLARIZATION. 



Mineral Objects . . . 768 

 Crystallization of Salts . . 769 

 Molecular Coalescence . . 774 



Organic Structures suitable 



for PolariscopeJ . 

 Micro-Chemistry 



774 

 776 



