Biological sciences and general biology Formation of humus by earthworms Kobunsha Koten Shingyaku Bunko

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Biological Science and General Biology
Kobunsha Koten Shinyaku Bunko / 『 The Origin of the Species 』 is very famous, but on the other hand, this book is a classic masterpiece of ecology and the last book of Darwin. This book is a record of Darwin's observations and experiments on the formation of corrosion by earthworms. He thinks that earthworms eat soil and discharge it to the surface of the earth, so the pastures were made by earthworms. He steadily and persistently observed and experimented for 40 years, and it proves that the earth was cultivated by 6 millimeters per year and improved to fertile soil. It introduces a magnificent field experiment in which he digs up the place 29 years after scattering the pieces of chalk and checks how much fertile soil the earthworms have accumulated on it.