In 1761 Bower seems to have had a hand in the anonymous Authentic Memoirs concerning the Portuguese Inquisition, in a series of letters to a friend. Around the same time he produced the fifth volume of his History of the Popes, with a summary of his dealings with Catholics. The rest of his history did not appear till just before the author's death, when the sixth and seventh volumes were published together; but with the period from 1600 to 1758 covered in 26 pages. The History of the Popes was reprinted with a continuation by Samuel Hanson Cox, in 3 vols., Philadelphia, 1844–5.
