It is called the Prussian Corps, because none but Prussians are admitted to it. It is called the Prussian Corps for no particular reason. It has simply pleased each corps to name itself after some German state. It is not named the Prussian Corps at all, but only the White Cap Corps. Any student can belong to it who is a German by birth.
Any student can belong to it who is European by birth.
Any European-born student can belong to it, except he be a Frenchman. Any student can belong to it, no matter where he was born. No student can belong to it who is not of noble blood. No student can belong to it who cannot show three full generations of noble descent. Nobility is not a necessary qualification.