A Seasonable Warning and Caution against the Insinuations of Papists and Jacobites in favour of the Pretender / Being a Letter from an Englishman at the Court of Hanover And What if the Pretender should Come? Reasons Against the Succession of the House of Hanover / With an Enquiry How Far the Abdication of King James, Supposing It to Be Legal, Ought to Affect the Person of the Pretender