X TABLE OF CONTENTS. 



CHy\.PTER IX. 



PAGE 



How Plants Obtain their Food, I 8i 



1. Sources of Plant Food 8i 



2. Parasites and Saprophytes 83 



3. How Fungi Obtain their Food 86 



4. Mycorhiza 91 



5. Nitrogen-gatherers 92 



6. Lichens 93 



CHAPTER X. 



How Plants Obtain their Food, II 97 



Seedhngs, 97. Digestion, 107. Assimilation 109 



CHAPTER XI. 

 Respiration no 



CHAPTER XII. 

 Growth 118 



CHAPTER XIII. 

 Irritability 125 



PART II. MORPHOLOGY AND LIFE HISTORY 

 OF REPRESENTATIVE PLANTS. 



CHAPTER XIV. 

 Spieogyra 136 



CHAPTER XV. 

 Vaucheeia 142 



CHAPTER XVI. 

 CEdogoniom 147 



CHAPTER XVII. 



COLEOCHiETE I53 



CHAPTER XVIII. 

 Classification and Addition Ar, Studies of the Aig.s; 158 



CHAPTER XIX._ 

 FUNOI : MUCOR AND SaprOli (,NIA 177 



