A letter to Theobald M'kenna, Esq. the Catholic advocate [electronic resource] : in reply to the calumnies against the Orange Institution; contained in his pamphlet Purporting To BE A Memoire ON Some Questions Respecting The Projected Union, &c. &c. &c. With Observations ON The New And Further Claims Of The Catholics, AS Affecting The Constitution And Protestant Establishment. With AN Appendix, Containing Some Animadversions ON The Popular Pamphlet Entitled, "an Impartial View Of The Causes Leading This Country To The Necessity Of AN Union," &c. &c. &c. By an Orangeman.