Jurisprudence is the study of law. Political Science has a very close and very old relation with the science of law. This relation is based upon the fact that the State, which is the subject-matter of Political Science, exists mainly for the purpose of making and enforcing law. In fact, social life of an advanced type cannot be possible without law, and law cannot be made and enforced without the legislative, administrative and judicial machinery of the State.
Moreover, the interdependence of the allied sciences of law and politics is further shown by the fact that die kinds and contents of laws are determined by the nature of the State. In a feudal State, there is feudal system of laws and jurisprudence, in a capitalist State, a capitalist system of laws and jurisprudence, and in a socialist State a socialist system of laws and jurisprudence. Indeed, their relationship is so close that jurisprudence is really a branch of Political Science.
Really the French writers include both of them in a single science, which they designate as Political Sciences. However, jurisprudence is a vast and separate science and is treated as an independent discipline, though closely allied to Political Science.