This book, first published in 1947 in English, brings together an impressive amount of research results conducted by the authors. Following Rudolf Steiner's indications, Eugen and Lily Kolisko provided compelling demonstrations on cosmic influences, particularly the lunar rhythms on plant growth, and the effects of minute quantities of substances - especially homeopathic dilutions. They systematically explored the indications from the Agriculture Course through numerous laboratory and field experiments. Lily Kolisko offers a discerning perspective on agriculture and food quality. She raises concerns about the impact of agricultural practices and inputs on soil degradation and consumer health, presenting a well-argued warning against the artificialization of human food, studying synthetic food additives such as vitamins, sugars, hormones, etc. In the last chapter of the book, Lily Kolisko calls for bringing together agricultural, medical, and educational impulses to establish a "living unity" that enables acting justly for the future of the Earth and Humanity. This book should interest a wide audience: farmers, vintners, gardeners, and agriculture consultants, as well as educators, therapists, veterinarians, pharmacists, nutritionists, and all researchers seeking to deepen their understanding of the living world and the effects of small quantities of substances.