In Kant and Modern Political Philosophy, Katrin Flikschuh argues that the original common possession of the earth, and in particular the limited spherical character of the earth (der Erdkugel), plays a much more fundamental role in Kant’s justification in cosmopolitan right than I am claiming that it does. Flikschuh’s argument isworth considering in some detail. Flikschuh bases this reading not on Kant’s “Perpetual Peace” essay but on his Rechtslehre, the first half of Die Metaphysik der Sitten (TheMetaphysics ofMorals).