Disturbance in Belfast.—At an early hour on Monday evening squibB and rockets began to be let off in Belfast in celebration of the Royal marriage, and immediately an immen'e crowd gathered in the principal streets of the town. After some time they evinced a riotous disposition by commencing to throw stones at each other and at the passers-by. Large bodies of the constabulary and local police were called out, one of whom received a very severe blow of a stone on the head. The disturbance rose to such a height that at half-past nine o’clock the mayor read the Riot Act and took prompt measures to disperse the rioters; but no sooner were they chased from one place than they appeared in another, and at ten o’clock the town was greatly disturbed. By eleven o’clock, however, the crowds had been all dispersed and order restored. The constabulary remained patrolling the streets.