This vegetable addition to the soil is generally known as humus.
Where there is an abundance of humus in the soil there is likely also to be an abundance of nitrogen.
The more there is of this humus in the soil, the more thriftily plants will grow.
These bodies have received the collective names Humus and Geine.
Most of the crops require tillage, and that is exhaustive of the store of humus.
The tree-roots burned with the humus, and down crashed the trees into the flames.
Where the layer of humus is deep, the fertility is greatest.
The mingling of humus and the subsoil is brought about by several means.
This, then, is the humus; the life which will for ever continue to develop.
The best evidence that the humus is alive is the fact that it breathes.