15. In descending from the domain of abstractions to that of facts, we must beware of denying the principles just established: they remain fixed. However, becoming incarnated in facts, they are clothed with a contingent character, determined by the centre in which their application is produced. Otherwise said, if every political form is good by itself and may be applied to the government of nations, the fact still remains that political power is not found in all nations under the same form; each has its own. This form springs from a combination of historical or national, though always human, circumstances which, in a nation, give rise to its traditional and even fundamental laws, and by these is determined the particular form of government, the basis of transmission of supreme power.