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
Roads,30-32,101-112
Rolling 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