CHEMICAL CONTENTS 



271 



starch, found in most plants. 

 Amyloses dextrin in various seeds. 

 cellulose in date seed. 

 inulin in dahlia tubers. 

 Fats and oils, as in flax seed, castor bean, cotton seed, 



corn and other seeds. 

 Muscus and mucilage, as in orchid roots, onions, quince 



seed, and other plants. 



Tannins, as in oak and hemlock bark, persimmon, and, 

 in general, in all plants that are astringent to the taste. 

 Glucosides. Complex products which on digestion yield 

 glucose sugar as one of the products. Amygdalin of 

 almond and peach nut, and indican of the indigo plant, 

 which yields the indigo dye, are examples. 

 452. Some of the cell contents are alkaloids, complex nitro- 

 genous products, of which the following rnay be mentioned : 

 atropin, in belladonna. 

 nicotin, in tobacco. 

 emetin, in ipecac root. 

 caffein, in coffee. 

 Alkaloids ^ strychnin, in mix vomica. 



morphin, in Papaver somniferum (opium 



poppy). 

 quinin, in cinchona or Peruvian bark 



tree. 



Re"sins, as in Coniferae. 

 Gum-resins, Caoutchouc, as in India-rubber plant. 



formic, as in stinging nettles. 

 acetic, as in fermented cider. 

 oxalic, mostly in form of calcium 

 Vegetable acids oxalate. 



malic, as in apple. 

 citric, as in lemon. 

 And many others. 



