A letter from a friend to Mr. John Mackmillan, wherein is demonstrate the contrariety of his principles and practices to the scripture, our covenants, confession of faith, and practice of Christ and the primitive Christians; containing also remarks on his and Mr. John Mackniely's printed protestation, ... compared vvith vvhat [sic] they gave in to the commission of the late General Assembly, upon the 29th. day of September. 1708. ...