The German law served as an inspiration for Polish legislators in the 20th century and continues to influences the Polish doctrine, jurisprudence and legal practice. This influence is visible also in Polish civil law. The aim of the book was to collect outcomes of research analysis of concepts and theories of Polish civil law which appeared to be examples of legal transplants from German law, and to determine their actual nature. The individual chapters of the book focus on specific concepts and theories of civil law. In the outcomes if comparative analysis the authors point out both the advantages and the risks of legal transplants, as well as distinguish between genuine and false transplants from German to Polish civil law.