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 volume. This mould is generally of a blackish colour and a few inches in thickness. In different districts it differs but little in appearance, although it may rest on various subsoils.
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भाषा अंग्रेज़ी ● स्वरूप PDF ● ISBN 9780259615903 ● प्रकाशक Forgotten Books ● प्रकाशित 2017 ● डाउनलोड करने योग्य 3 बार ● मुद्रा EUR ● आईडी 7316791 ● कॉपी सुरक्षा Adobe DRM
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