CONTENTS Xlll 



Magnesium ; Aluminum ; Iron ; Phosphorus ; Sulfur ; Silicon ; Chlo- 

 rin ; Experiments ; Problems. Pages 155-174. 



CHAPTER XXIII 



The Non-Nitrogenous Organic Compounds of Plants. Organic 

 matter ; Non-nitrogenous and nitrogenous organic compounds ; 

 Classification of non-nitrogenous compounds ; Carbohydrates ; 

 General characteristics ; Cellulose ; Occurrence ; Physical proper- 

 ties ; Chemical properties ; Function and value ; Food value ; 

 Amount of cellulose in plants ; Crude fiber ; Starch ; Occurrence ; 

 Physical properties ; Chemical properties ; Function and value ; 

 Foo value of starch ; Amount of starch in plants ; Dextrin ; Struc- 

 tural formulas ; Sugar ; Classification of sugars ; Occurrence of 

 sucrose ; Physical and chemical properties of sucrose ; Milk-sugar ; 

 Maltose ; Inversion of sucrose ; Refining of sugar ; Occurrence of 

 dextrose ; Chemical and physical properties ; Levulose ; Miscel- 

 laneous sugars ; Optical properties of sugar ; Sugar-beets ; Food 

 value of sugar ; Gums ; Pentosans ; Pectin bodies ; Nitrogen-free 

 extract ; Fats ; Presence in plants ; Physical properties ; Chemical 

 composition ; Stearin ; Palmitin ; Olein ; Miscellaneous fats ; Saponi- 

 fication ; Fatty acids ; Waxes ; Food value of fat ; Amount of fat 

 in plants and foods ; Ether extract ; Organic acids ; Occurrence in 

 plants ; Tartaric acid ; Malic acid ; Succinic acid ; Oxalic acid ; 

 Citric acid ; Tannic acid ; Function and food value of the organic 

 acids ; Essential oils ; General properties ; Occurrence ; Chemical 

 composition and properties ; Essential oils of agricultural crops ; 

 Synthetic production of essential oils ; Amount of essential oils in 

 plants ; Food value ; Miscellaneous compounds in plants ; Relation- 

 ship of non-nitrogenous compounds of plants ; Food value of the 

 non -nitrogenous compounds ; Experiments and questions. Pages 

 175-213. 



CHAPTER XXIV 



The Nitrogenous Organic Compounds of Plants. Amount of 

 nitrogenous matter in plants ; Different terms applied to nitroge- 

 nous compounds ; Complexity of composition ; Classification of 

 nitrogenous compounds ; Proteids ; General composition ; Oc- 

 currence ; Physical properties ; Chemical properties ; Classification 



