Boston, Aug. 27, 1861. Several t'nousand peoplo gathered around the Tremont House to-night, the occasion being a serenade to the Hon. Joe Holt oí' Kentucky After appropriate airs by the band, Mr. Holt appeared on the steps oí the hotel, and was introduced to the crowd by Edward Everett, wbo made sorae complimentary and very patriotic remarks. Mr. Holt was reoeived with earnest enthusiasm, and spoke about fifteen minutes. Mr. Holt said ho came to Boston not only to see the cky, but to revivo his patriotism amidst the thrilling associations that clusterod aroud the eradle of Liberty. He was most gratefully surprised" by the cordmlity of his reception, and was thankful for that re-cognition of fidelity to their conimon country, and also lor the kind allusion to his native State, Whote stnrs has boen so long obsoured by imfaithful public men, but which were now preparing to shine with the luster of other clays. Sho had assumed her present position unJer no impulse of passion, but caltnïy and in view of all the gloom and peni surrounding the Union, she says sheloves it sttö, and will elingto it as she has in its strengt h and glory. That, which she so nobly declaied at the ballot-box it was her duty to make good on the battle-field, and what she had so well begun mustbe iaithfully perfonned. Full would bs the pleasure of hisjoy when he went home to see Kentucky and Massachusetts on the same field oí dangor, rebuking those traitorous men thatstrove to make them enemies. In his recent extended tour he had nowhere found the public voice faint. The flag must be vindicated. He nowhero heard the word " compromise"- a word not only uttered by disloyal lips, and those in the interest of vebellion. So long as rebels have arma in their hands there was nothing to compromise, but the honor and integnty of the Government. One great peril cannot be disguised, the capital menaced by a great army, and nothing but our swords could save it. They were powerful and reckless, and not less so becauae they were figtating, Cataline and his co conspiratry feïl with face to tho enemy, and so would the rebel leaders oí the South. The more prompt, earnest, and uni ted we were, the briefer the struggle and the less the danger. Bat we must prepare for the worst - a ruined commerce, bankruptcy, grass growing in the streets. Our institutions were worth all we could sacrifice - for all we are and have are the fruits of those institutions. If we think of ourlands, gold, bouses, uierchandize, or blood, in contrast with our integrity, wo are lost. Mr. Holt alluded to disloyalty in our midst as one of the worst obstacles to the success of our cause, but rejoiced in the late decided measures of the President to subdue this olement of weakness. It wa9 in vain to toil at the pumps while men were kept on board boring holes in the bottom of the ship. The address of Mr. Holt was receivod with the greatest enthusiasm.