Translations:Benutzer:Arian/Klett-Mini-Test/860/en

When these conditions are assured, the earthworms (*Lumbricidae*) are drawn up from the deeper zones of the soil through their channels into the mulch layer, where through their beneficent digestive activity they convert the nutritive humus into stable humus. What in spring was a kind of eversion — an externalising of the life of the root and its growing-together with the earth, forming exogenous symbioses — what is at work in the body of the earthworm, among other things, is an invagination of life, a process of internalisation. In the former case humus is broken down: that is, the life preserved within it is converted through bacterial-symbiotic activity in favour of vegetative growth. In the case of invagination, present life is drawn inward through endogenous symbiosis under the direction of the