Arrival Of The Brittania. Twelve Days Later From Europe: Hig...

TAe Steamship Britannia from Liverpool, on the I9th uit. arrived at Boston last Saturday evening, bringing news of the highest interest. The most important intelligence of a general nature, is that of the course adoptad by the British Government, to put a stop to the progress of agitation in Ire-land. A great repeal meeting had been called for Sunday, the 8th uit. at Clontarf, which was expected to outnumber any of the "monster meetings" thus far held, when. on Saturday anemoon, the 7th, the Lord Lieutcnant of Ireland De Grex, issued his proclamation, forbidding, the meeting. The Committee of the Re-peal Association was immediately callei together, and it was resolved, on advice1 strenuously urged by Mr. O'Connelí, that the meeting at Clontarf should be countermanded, and every means used to prevent the people from disobeying the order of the Lord Lieutcnant. At the same time Mr. O'Connell avowed his intention o remaining in Dublin to continue the agitation, instead of proceeding to his country seat as he had intended. A notice of the abandonment of the meeting was adopted, and it was immediately printed, in the same shape as the Lord Lieutenant's proclamation, surmounted, like that document, by the royal arms, and industriously circulated. Persons on the part of the Association were sent to all the outlets of Dublin, and to all the places at which preparatory assemblages of the repealers were to be held, to disperse and send back those coming to the meeting but the time at which the prohibition was declared, was so near that appointed for the meeting, that a great many were already on the road towards Clontarf. On Sunday, att the troops in Dübli were paraded, supplied wiih 60 rounds of ball eartridge, and disposedon the ground" appointed for the meeting, and on the roads thither. The day, ho.wever, passed off quietly, and the troops were withdrawn at night without distu.rbancev On the Qth and 11 th, great meetings, of the repeal association were held iDublin, at which Mr. O'Connell was present and spoke. On the 14th, Mr. O'Connell and his son were arrested upon Warrants issued by Judge Burton, charg ing them with having conspired, with otters, to change the laws of the real'm, and with having raised money for that purpose, and with having, before various assemblies of thepeople, used inflamraatory language. The Attorney General was to proceed by indictment, and not ex-officio, if the grand jury found bilis. Mr. O'Connel immediately after giving báil by entering into recognizances in the sum