 The merits of Lange’s view concerning the “conversion” of mass-energy equivalence are essentially the same as the merits of both the Bondi-Spurgin interpretation and Rindler’s interpretation. All these interpretations agree that there are important cases where we have now learned enough to assert confidently that purported “conversions” of mass and energy are merely cases where energy of one kind is transformed into energy of another kind. Aside from the comparatively minor issue concerning the “reality” of rest energy, the main demerit of Lange’s view is that it might potentially mislead unsuspecting readers.