INDEX. 



151 



PAGE 



Potash 23, 83, 85 



salts 85 



Potato, cells of 69 



Prepared fertilizers .... 85, 86 



Pressure of the air 43 



Protein 118,119 



Q- 



Quartz rock 22 



Quicklime 13, 86 



Radicle, the 59, 62, 63 



Rain 42. 45, 46, 47 



Rainless regions 47 



Rain water, a fertilizer . . . 108 



Ratio, nutritive 125 



Ration, balanced 125 



Rations, how made up . . . . J27 



examples of 128, 129 



Requirements of animals . . . 127 



Respiration 20 



Rice plants 101 



Rochelle powders 13 



Rocks, ancient 30 



RoHingland 107 



Rootlets 64 



Roots . 63, 64 



air necessary for .... 101 



in wet soil 108 



of buttercups 63 



of clover 64 



of the maple 63 



tap 63 



tuberous 63 



Rotation of crops . . . .110-112 



Ruminants 1 '34-136 



stomachs of 134,135 



Running water, effect of ... 31 

 "Runout" land . . 79 



Saliva j.)3 



Salivary glands ];j;j 



Salt 11, 12, 17, 65, 87 



Saltpeter 84 



Sandstone 22, 31, 32 



PAGE 



Sandy soil 37, 38, 105 



Sap of plants 65 



flow of 71, 72 



Saturated soil 101 



Sea breezes 45 



Seeds 54 



unripe 55 



Selection of food by plants . . 73 



Sepals 74 



Shallow cultivation ..... 107 



Silicates 22 



Silicon 22,73 



Silicic acid 13 



Simple substances 7 



Slag 85 



Slaked lime 12 



Smoked glass 21 



Smut 69 



Snow 47 



crystals 17 



Sodium 13, 23 



Soil, formation of .... 27, 30 



alluvial 105 



composition of ... 3^, 35, 78 



fertile . 77 



from granite 79 



from limestone 79 



sandy 37, 38. 105 



warmth of 110 



Solids, liquids, and gases ... 16 

 South Carolina rock .... 85 

 Squashes, mixture of .... 74 



Stamens 74 



Starch 60 



of potatoes 69 



Stomach, the 133, 134 



Stomachs of ruminants . . .135 



Stomata 60, 61 



Storms 50 



Subsoil 104 



plowing 105 



Substances, simple 7 



Success in agriculture . . . . 141 



Sugar 13, 60 



Sulphates 13,84 



Sulphate of ammonia . , . . 84 

 of lime ....... 13 



of potash 23 



Sulphur 22 



Sulphuric acid . , 10, 13, 21, 22, 66 



