152 



INDEX. 



PAGE 



Summer fallowing 101 



Sunlight, effect of 62 



T. 



Tap-roots 63 



Temperature 44, 50 



Thermometer 44 



Tillage, deep 104 



Time to plow 105 



Timothy grass 73 



Tuberous roots 63 



Turnips 63 



U. 



Underdrains 

 Unripe seeds 

 Urea . . 



108 



55 



138 



V. 



Valleys, cause of 30 



Value of foods 121, 122 



Variety of food 129 



Vegetable matter 35 



Vegetable mold . . . . 35, 79 



Vegetable tissue 69 



Vegetation, carboniferous . . 36 

 Veins, the 137 



PAGE 



Vitality of seeds 54 



Volatile substances 21 



W. 



Warm wave 49 



Warmth for germination ... 50 



Water, magnified 9 



in foods 118 



in the animal body . . . 115 



molecule 11 



vapor 41 



Watering plants 62 



Weather, the 49 



Weeds 102 



Wetland 109 



White clover 63 



Wind 34, 35, 44, 45 



Wood, composition of .... 7 



Wood, porosity of 15 



Work, effect of 117 



Y. 



Young animals 116 



Zinc ' . . . 11, 12 



Zinc chloride 12 



