CONTENTS 



I'AGE 



Amygdalin . . . . . . . . . . .178 



Dhurrin 179 



Phaseolunatin .......... 179 



Lotusin ............ 180 



Saponins 180 



General properties and uses 180 



Solubility 181 



Physiological action 182 



Chemistry 182 



Reactions 184 



Other glucosides 184 



Sinigrin 184 



Preparation .......... 184 



Coniferin 185 



Salicin 186 



Preparation .......... 186 



Indicane 188 



Identification 188 



SECTION IV.— TANNINS 190 



Occurrence ............ 191 



Microchemical reactions 194 



Chemistry ............ 197 



Pyrocatechol, catechol or pyrocatechin 198 



Reactions 199 



Resorcinol ............ 199 



Reactions ........... igg 



Hydroquinone ........... 199 



Reactions ........... igg 



Protocatechuic acid 200 



Reactions 200 



Pyrogallol or pyrogallic acid 201 



Reactions 201 



Phloroglucinol ........... 201 



Reactions 202 



Gallic acid 202 



Reactions 203 



Ellagic acid ............ 203 



Reactions 204 



Phlobaphenes 205 



Tannins as glucosides .......... 205 



Classification of tannins ......... 206 



Properties and description of individual tannins 208 



Pyrogallol tannins. ......... 208 



Gallotannic acid ......... 208 



Extraction ......... 210 



Reactions . . . . . . . . .211 



Detection of gallic acid in presence of gallotannic acid . 211 



Constitution 211 



Ellagitannic acid 213 



