I: Preparation of high dilution of drugs. 1.1. Sources of drugs. 1.2. Proving of drugs. 1.3. Preparation of mother tinctures. 1.4. Potentization of drugs. 1.5. Preservation of remedies and pharmaceutical forms. II: Evidences for high dilution effects. 2.1. Clinical evidences. 2.2. Experimental evidences from animals. 2.3. Experimental evidences from plants. 2.4. Evidences from in vitro tests. III: Physical basis of drugs at high dilutions. 3.1. NMR spectroscopy. 3.2. Infra-red spectroscopy. 3.3. Electronic spectroscopy. 3.4. Spectrofluorometry. 3.5. Thermoluminiscence. 3.6. Molecular association and water structure. IV: Mechanism of action of potentized drugs. 4.1. Lateralities and Homeopathy. 4.2. Time modalities and Homeopathy. 4.3. Similia principle and Homeopathy. 4.4. Non-linear systems and Homeopathy. 4.5. Miasms and their biological basis. 4.6. Polycrests, reappearance of past diseases and holism. 4.7. Action of drugs at ultra high dilutions. 4.8. Role of carbohydrates in recognition process. 4.9. Structured water and early life.