Download or read book The Formation of Vegetable Mould Through the Action of Worms (Annotated) written by Charles Darwin and published by Createspace Independent Publishing Platform. This book was released on 2015-11-07 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.