An address to the electors, and other free subjects of Great Britain; occasion'd by the late secession. In which is contain'd a particular account of all our negociations with Spain, and their treatment of us, for above ten years past. The fourth edition. To which is added, an appendix, containing a letter from Mr. Keene to the South-sea company, after he had receiv'd the King of Spain's declaration, and actually sign'd the convention, with some observations upon it