The Civil Code and the regulations of the inheritance law during the period of its validity, stopped being only „law on book” and became „law in action”, including proceedings of making the statement about heredity acceptance or rejection. They created a specified jurisprudence, making the patterns of civil legal behavior for citizens, to which the works of Professor Jan Gwiazdomorski contributed. Their thoroughness of the analyses, the high quality of phrasings, the clearness of terminology desygnatum, fidelity to the law and completeness of scientific documentation as Polish as a foreign, remains the model for the future generation of the civil lawyers.