CONTENTS 

 CHAPTER IX 



PAGE 



The Study of the Rocks 125 



CHAPTER X 



The Microscope as Detective .... 137 



CHAPTER XI 

 Bacteria 152 



CHAPTER XII 



"y^MEDiCAL Work with the Microscope . . . 167 



CHAPTER XIII 



The Microscope and Agriculture . . . 178 



CHAPTER XIV 



The Microscope and Insect Life .... 192 



CHAPTER XV 



The Microscope by the Seaside — Animal Life . 208 



CHAPTER XVI 



The Microscope by the Seaside — Plant Life . 225 



CHAPTER XVII 



Micro-Telescope and Super Microscope . . 239 



CHAPTER XVIII 



Chemistry and the Microscope .... 248 



10 



