xiv CONTENTS 



SECTION 2. THE CARBOHYDRATES PRODUCED 



IN CROPS. 



PAGE 



(a) Sugar. Its production in tropical and temperate climates. The manu- 



facture and purification of sugar. Sugar-cane, sugar beet, dates, 

 mangels, turnips in 



(b) Starch. Its production and manufactured forms. Wheat, maize, rice, 



potatoes, sago, tapioca . . . . . . . . H7 



(c) Cellulose. Fibres, etc. The chief kinds. Their manufacture and uses. 



Cotton, linen, jute, hemp, timber, paper 124 



(d) Gums and mucilage . . . . . . . . ''31 



References ............ 132 



SECTION 3. THE OIL-BEARING PLANTS. 



(a) Linseed. Its growth and use for oil and cattle food. Poisonous com- 



pounds sometimes developed ........ 135 



(b) Cotton. Its growth and use for oil and cattle food. Different kinds 



of products according to climate and methods of manufacture . .137 



(c) Soya bean. Growth and methods of pressing for oil and cattle food . 138 



(d) Palm-nuts and coconuts. Their growth and use for oil, butter substi- 

 tutes, and cattle foods 139 



(<?) Earth-nuts. Rape, safflower, sesame, niger, mowha .... 142 



(/) The essential oils 145 



References ............ 145 



SECTION 4. THE NITROGEN COMPOUNDS 

 IN PLANTS. 



(a) Cereal proteins " . .147 



(b) Legumen proteins . . . . . * * . -15 



(c) Root crop proteins 151 



(d) Oil seed proteins . . . . 151 



(e) The alkaloids 152 



References ......... 157 



SECTION 5. MISCELLANEOUS PLANT 

 PRODUCTS. 



(a) Tea and cocoa .....<.. 158 



(6) Coffee 160 



(c) Tannin * 162 



(d) Rubber 163 



(e) Indigo 165 



(/) Fruit 1 66 



References .168 



