XI 



Page. 



PRACTICAL WORK ... ... ... 107 



Mechanical analysis of soil ... ... 108 



Water in soils ... ... ... 110 



Vegetable matter in soils ... ... 113 



Chalk in soils ..Y ' ... ... 115 



CHAPTER vi. 



PLANT FOOD AND MANURES ,.. ... 117 



Nitrogenous matter... ... ,. 117 



Leguminous plants and nitrogen *. 120 



Mineral matter ..,,... ... .^ 123 



Manuring ... -... ... ... 124 



General manures ... .< 125 



Nitrogenous manures .... ... 127 



Phosphatie manures... ... ... 128 



Potassic manures ... ... ... 129 



PRACTICAL WORK ... ... ... -129 



Experiments with manures .. ... 130 



Leguminous plants ... ... ... 134 



CHAPTER vn. 



FLOWERS AND FRUITS .... ... ... 13(5 



Parts of a flower ... ... ... 136 



Uses of the parts of a flower... ... 140 



Insects and flowers... ... ... 143 



Wind-pollinated flowers ... . . 146 



Fruits and seeds ... ... ... 147 



Dispersal of seeds ... ... ... 149 



Variation in seedlings ... .,. 153 



PRACTICAL WORK ... ... ... 155 



Parts of a flower ... ... ... 155 



Experiments in cross-fertilization ... 157 



Dispersal of seeds ... ... ... 160 



