CONTENTS. IX 



2. Acids. 134-136 85 



a. Tyrosin. 134, 135 85 



b. Ellagic Acid. 136 86 



3. Aldehydes. 137 86 



Vanillin. 137 86 



4. Quinones. 138-141 87 



a. Juglon. 139 ; 87 



b. Emodin. 140 87 



c. Chrysophanic Acid. 141 ....-.* 88 



5. Hydrocarbons. 142-149 88 



a. Ethereal Oils. 144 89 



b. Resins and Terpenes. 145-149 90 



6. Glucosides. 150-164 92 



a. Coniferin. 151 92 



b. Datiscin. 152 93 



c. Frangulin. 153 93 



d. Hesperidin. 154 93 



e. Coffee-tannin. 155 94 



f. Potassium Myronate. 156 95 



g. Phloridzin. 157 95 



h. Ruberythric Acid. 158 95 



i. Rutin. 159 96 



k. Saffron-yellow. 160 96 



/. Salicin. i6oa 96 



m. Saponin. 161 96 



. Solanin. 162 97 



o. Syringin. 163 98 



p. Glucoside (?) from the Stimulus-conducting Tissue of Mimosa 



pudica. 164 . . : . -i 98 



7. Bitter Principles. 165, 166 99 



a. Calycin. 165 ^v^.' 99 



b. Spergulin. 166 . 99 



S. Coloring Matters. 167-197 100 



a. Pigments of the Chromatophores. ^ 168-179 100 



a. Chlorophyll-green. 169 . . ' 101 



ft. Carotin. 170-172 101 



y. Xanthin. 173 103 



6. Coloring Matter of Aloe Flowers. 174 ...... 103 



e. Coloring Matters of the Floridece (Phycoerythrin). 175. 103 



C. Coloring Matters of the /^^/^/^^(PhycophceinV 176 . 104 



77. Coloring Matters of the Cyanopkycece (Phycocyanin). 177. 104 



O. Coloring Matters of the Diatomacece (Diatomin). 178 . 105 

 i. Coloring Matters of the Peridineae (Peridinin and Phyco- 



pyrrin). 179 105 



b. Fatty Pigments or Lipochromes. 180, 181 106 



f. Other Coloring Matters dissolved in Fats or Ethereal Oils. 



182 107 



d. Coloring Matters dissolved in the Cell-sap. 183-185 . . . 107 



a. Anthocyanin. 184 107 



