A master-key to popery [microform] : in five parts. Part I. Containing a discovery of the most secret practices of the secular and regular Romish priests in their auricular confession. Part II. A true copy of the Pope's yearly bull of indulgencies and pardon of sins, to all those that serve in the war against the enemies of the Romish religion. The explanation of the bull, with some remarks upon it. Part III. An account of their masses, privileg'd altars, transubstantiation, and purgatory, and of the means the priests make use of to delude the people. Part. IV. Of the inquisitors, and their practices in several instances. Part V. Of their prayers, adoration of images, and relicks, &c. / By D. Antonio Gavin, ; born and educated in Spain, some years secular priest in the Church of Rome, and since 1715, minister of the Church of England