Or, if the point is to compare scientifically the norms of present European law regarding property, the concept of property as defined on this occasion must be a concept of the science of this particular family of laws. For the scientific comparison of norms of different legal systems demands that concepts of the sciences of these different legal systems be subordinately arranged under the corresponding concept of the science of the family of laws which is made up of these systems. Consequently the material to be taken into consideration will be only the norms of this family of laws.--Here again, indeed, it may seem obscure that the concepts defined are really concepts of the science of this family of laws. For the concepts that belong to the science of a family of laws may likewise be defined by defining the corresponding concepts of general jurisprudence and tacitly adding the characteristic of being concepts of norms of this particular family of laws. Finally, if it comes to pass that the point is to compare scientifically what the norms of the most diverse systems of law have in common, the concept of law as defined on this occasion must be a concept of general jurisprudence. For the scientific comparison of norms of the most diverse systems and families of laws demands that concepts which belong to the sciences of the most diverse systems and families of laws be subordinately arranged under the corresponding concept of general jurisprudence. Consequently the material to be taken into consideration will be the norms of the most diverse systems and families of laws. Here,--where the point is to take the first step toward a scientific comprehension of teachings which pass judgment on law, the State, and property in general, not only on the law, State, or property of a particular system or family of laws,--the concepts of law, State, and property must necessarily be defined as concepts of general jurisprudence. For a scientific comprehension of teachings which deal with the common substance of the most diverse systems and families of laws demands that concepts of this common substance--consequently concepts belonging to general jurisprudence--be formed. Therefore we have to take into consideration, as our material, the norms (especially regarding the State and property) of the most diverse systems and families of laws. 2.--LAW _Law is the body of legal norms. A legal norm is a norm which is based on the fact that men have the will to see a certain procedure generally observed within a circle which includes themselves._ 1. A legal norm is a norm.