INDEX 



Acid waters, 40 



Air in soil, 16, 70, 95 



Bars in estuaries, 122 



Black soils, 36 



Blowing sands, 22 



Bricks, 10, 16-18 



Chalk, 26, 96 



Chalk soils, 110-112 



Clay, 6, 9-21 



Clay soils, 75, 100-102 



Chfifs, 116-119 



Darwin's experiments, 11, 56 



Deltas, 122 



Drainage, 19, 96 



Dwellers in the soil, 63-63 



Earthworms, 54-56 



Error of experiment, 48 



Fallow, 44, 95 



Fens, 112 



Flora, 114 



Fords, 126 



Frost, action of, on soil, 83 



Grassland, 75 



Grit, 6 



Hales's experiment, 73 



Heaths, 104 



Heavy soils, 100 



Hoeing, 86-93 



Humus, 36, 51, 93, 125 



Hypotheses, 36 



Land slips, 12 



Leaf mould, 33 



Light soils, 104 



Lime, action of, on clay and soil, 



19-21, 96-98 

 Lime water, 19 

 Loams, 2, 65, 108 



Marsh gas, 40 



Micro-organisms, 56-62 



Moorland, 80 



Mulch, 87, 90 



Peat, 37-40, 130 



Peat bogs, overflow of, 38 



Perspiration of plants, 74 



Plant food, 41-52, 62 



Plant requirements, 64 



Ploughing, 82 



Pot experiments, 41-52, 54, 69, 71 



Eoads, 30-32, 101-112 



Boiling the soil, 84 



Sand, 6, 22-32, 41 



Sand dunes, 22 



Sandy soils, 68-72, 102-108 



Shrinkage of clay, 10 



Silt, 7 



Soil sampler, 82, 88 



Sowing seed, 84 



Springs, 24-31, 111 



Subsoil, 2, 4, 42, 48-51 



Swelling of clay, 11 



Swelling of peat, 38 



Temperature of soil, 86-93 



Tilth, 86 



Van Helmont's experiment, 46 



Villages, situation of, 24, 30, 126 



Wastes, 101, 104 



Water content of soil, 88-93 



Water, movement of in soils, 65- 



68 

 Water supply and plant growth, 



69-74 

 Weathering, 116 

 Weeds, 94, 97 

 Woodland, 80, 101 



PRINTED IN ENGLAND BY J.B. PEACE, M.A. 

 AT THE CAMBRIDGE UNIVERSITY PRESS 



