SINOPSIS DEL LIBRO

The share which worms have taken in the formation of the layer of vegetable mould which covers the whole surface of the land in every moderately humid country is the subject of the present volumeThis mould is generally of a blackish colour and a few inches in thicknessIn different districts it differs but little in appearance although it may rest on various subsoilsThe uniform fineness of the particles of which it is composed is one of its chief ...Seguir leyendo