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three, now collected in one volume, were written at separate times, and contain three distinct parts of the same subject; that is to say, the Infallibility of the Roman Pontiff.

The first, which treats of the eighteenth Centenary of St. Peter's martyrdom, simply affirms the doctrine of Infallibility as it has been enunciated and taught by the Theological tradition of the Church.

The second traces the line of the historical tradition by which the same Catholic doctrine has been affirmed.

The third states and explains the doctrine of the Infallibility of the Roman Pontiff as it has been defined by the Œcumenical Council of the Vatican.