  In another place, Bondi makes a similar point: “Comparison with observation becomes then possible and renders the PCP liable to observational disproof. This possibility of a clear-cut disproof establishes the scientific status of PCP” (Bondi 1957, p. 198). Comments such as this make clear Bondi’s committment to a Popperian addition to the basic deductive methodology he inherited from Milne. 