CONTENTS IX 



i 



CHAPTER IX 



CELL CONTENTS 



PAGE 



Chlorophyll 182 



Leucoplastids 183 



Starch grains 183 



Occurrence 184 



Outline 185 



Size 185 



Hilum 185 



Nature of hilum 188 



Inulin 194 



Mucilage 194 



Hesperidin 196 



Volatile oil 196 



Tannin 196 



Aleurone grains 197 



Structure of aleurone grains 197 



Form of aleurone grains ^ 197 



Description of aleurone grains 198 



Tests for aleurcne grains 198 



Crystals 200 



Micro-crystals 200 



Raphides 200 



Rosette crystals 202 



Solitary crystals 205 



Cystoliths 210 



Forms of cystoliths 210 



Tests for cystoliths 215 



PART III 



HISTOLOGY OF ROOTS, RHIZOMES, STEMS, BARKS, 

 WOODS, FLOWERS, FRUITS AND SEEDS 



CHAPTER I 



ROOTS AND RHIZOMES 



Cross-section of pink root 219 



Cross-section of ruellia root 219 



Cross-section of spigelia rhizome 223 



Cross-section of ruellia rhizome 226 



Powdered pink root 227 



Powdered ruellia root 227 



