The Tigers' ball, which took place last evening in the Mechanics' Fair building, was a grand and entirely successful affair. The building was magnificently decorated inside, and an almost unlimited number of beautiful toilets were visible in every part of the hall. Notable military gentlemen from all parts of New England, and the wealth and beauty of Boston, were present. The music was superb. A large number of Harvard students were present, who, departing from the building, marched down Huntington avenue, making the morn resound with college songs, which contrasted well with the shouts of hackmen and the rumbling of passing carriages. The ball ended at an early hour this morning, and was pronounced by all a magnificent success.