The plan to unite Paris and London with pneumatic tubes has been reported on favorably by French engineers, and submitted to the Government. It is proposed that two pneumatic tubes be laid, following the line of the Northern Railroad from Paris to Calais, thence across the channel to Dover, and following the line of the South-Eastern Railroad to London. Letters could thus be transmitted between the two capitals in one hour. Wagonets like those now used to transport telegrams from Paris are used, weighing ten kilograms and capable of carrying five kilograms weight of mail matter. Twenty pneumatic trains are to be started every hour. Erin on Columbia's Shore. BRIGHT INCIDENTS OF CORRELATIVE IRISH HISTORY. That history repeats itself in many and sometimes mysterious ways, is rather interestingly illustrated in a talk with Mr. Denis McGillicuddy, of Medford. This gentleman emigrated from Ireland to America about forty years ago, and in the meantime has been a prominent builder and contractor. His works include the construction of nineteen Catholic Churches, among them in 1870-1, St. Augustine's Church of South Boston, and also the mansion of Archbishop Williams and his priests near the Cathedral in this city. His story links two countries together in its detail, though centuries and three thousand miles of ocean divide them, and the incidents he related yesterday to the writer, as follows: "When I read the account of the truly Christian celebration of Christmas in St. Augustine's Church, South Boston, it brought to my mind an incident in connection with the building of that beautiful and elaborately finished edifice and its worthy pastor, Rev. Father O'Callaghan, which I should think might very well interest the general reader; but it certainly ought to be interesting to those who familiarize themselves with comparisons in history. Among the artisans employed on St. Augustine's, when in process of erection, were four men bearing the historic names of O'Keefe, O'Sullivan, O'Falvey and O'Connell. Now, sir, in the Annals of Ireland, by the Four Masters, we find that Ceallachan (Callaghan), a celebrated warrior of the Erigenian race, was King of Cashel in the tenth century, and having defeated the Danes in several battles, Sitric, who was then chief of the Danes, in Dublin, made proposals of peace to the King of Munster. Ceallachan went to Dublin on that mission accompanied only by his body-guard, and one or two friends. On his arrival there, his party was treacherously attacked, and Ceallachan was taken prisoner,--the entire proceedings, on the part of the barbarians being a conspiracy to get Ceallachan, their formidable opponent, into their power. The Munster (South of Ireland) chiefs, in order to release their king from captivity, collected a powerful force, numbering over twelve thousand troops commanded by Denis O'Keefe, Prince of Fermoy, and O'Sullivan, Prince of Beara. They also organized a large