These concepts of law, State, and property contain all the characteristics that belong to the substance of a particular legal system. They embrace only the substance of this system. They may, therefore, be called concepts of the science of this system. For we may designate as the science of a particular legal system that part of jurisprudence which concerns itself exclusively with the norms of a particular legal system. The concepts of law, State, and property in the science of a legal system are distinguished from the concepts of law, State, and property in the sciences of other legal systems by this characteristic,--that they are concepts of norms of this particular system. From this characteristic we may deduce all the characteristics that result from the special substance of this system of law in contrast to other such systems. The concepts of property in the present laws of the German empire, of France, and of England are distinguished by the fact that they are concepts of norms of these three different legal systems. Consequently they are as different as are the norms of the present imperial-German, French, and English law on the subject of property. The concepts of law, State, and property in different legal systems are to each other as species-concepts which are subordinate to one and the same generic concept. 2. Second, one may understand by the concepts of law, State, and property the concepts of law, State, and property in the science of a particular family of laws. These concepts of law, State, and property contain all the characteristics that belong to the common substance of the different legal systems of this family. They embrace only the common substance of the different systems of this family. They may, therefore, be called concepts of the science of this family of laws. For we may designate as the science of a particular family of laws that part of jurisprudence which deals exclusively with the norms of a particular family of legal systems, so far as these are not already dealt with by the sciences of the particular legal systems of this family.