On to-morrow (Sunday) a mass meeting of the tenant farmers of Mayo, Galway, and Roscommon will be held at Irishtown, a few miles outside Claremorris, for the purpose of representing to the world the many and trying ordeals and grievances the tenant farmers labour under. There will be several leading gentlemen present who will speak on the occasion, amongst whom will be John O'C. Power, Esq., M.P., John Ferguson, Esq. Glasgow, and J.J.Louden, Esq. Westport. The meeting, it is considered, will be one of the largest ever held in Connaught.