He has qualities which especially commend him at this time. He is firm, ever true, honest, determined, a lover of the Right. With a courage that charms opposition, he would not fear to stand alone against a fervid majority. Knowing war by fearful familiarity, he is an earnest defender of peace. With a singular experience of life in other countries, he now brings the stores he has garnered up, and his noble spirit, to the service of his fellow-citizens.

But we are assembled to-night less to consider his praises—grateful as these would be to me, who claim him as friend—than to examine the principles now in issue. Not names, but principles, are now in issue. Proud as we may be of our candidate, we feel, and he too feels, that his principles on the grave questions now pending are his truest recommendation.

In examining these questions, I shall regard those only which are put in issue by the Whigs. It is with the Whigs that I have heretofore acted, and may hereafter act,—always confessing loyalty to principles above any party.

The Resolutions of the recent Whig State Convention present five different questions, with the opinions of the party thereupon. These are the Veto of the President, the Sub-Treasury, the Tariff, Slavery, and the Mexican War. Now, of these five questions, it will not be disguised that the last two are the most important. Slavery is a wrong which justice and humanity alike condemn. The Mexican War is an enormity born of Slavery. Viewed as a question of dollars and cents, it overshadows the others; while the blackness of its guilt compels them to the darkness of a total eclipse. Base in object, atrocious in beginning, immoral in all its influences, vainly prodigal of treasure and life; it is a war of infamy, which must blot the pages of our history. No success, no bravery, no victory can change its character. Vainly will our flag wave in triumph over twenty fields. Shame, and not glory, will attend our footsteps, while, in the spirit of a bully, we employ superior resources of wealth and numbers in carrying death and devastation to a poor, distracted, long afflicted sister republic. Without disparaging the other questions, every just and humane person will recognize Slavery and the Mexican War as paramount to all else,—so much so, that whoever is wrong on these must be so entirely wrong as not to deserve the votes of Massachusetts men.

The Whig Convention has furnished a rule or measure of opinion. It has expressly pledged the Whigs "to promote all constitutional measures for the overthrow of Slavery, and to oppose at all times, with uncompromising zeal and firmness, any further addition of slaveholding States to this Union, out of whatever territory formed." The Mexican War it has denounced as having its origin in an invasion of Mexico by our troops.

Now on these subjects Dr. Howe's opinions are clear and explicit. He is an earnest, hearty, conscientious opponent of Slavery, and in his speech at your former meeting he denounced the injustice of the Mexican War, and, as a natural consequence, demanded the instant retreat of General Taylor's troops to the Nueces.

And this brings me to Mr. Winthrop. Here let me carefully disclaim any sentiment except of kindness towards him as a citizen. It is of Mr. Winthrop the politician that I speak, and not of Mr. Winthrop the honorable gentleman.

And, first, what may we expect from him against Slavery? Will he promote all constitutional measures for its overthrow? Clearly one of these is the Abolition of Slavery in the District of Columbia. This is within the constitutional powers of Congress, and has been called for expressly by our State. It has sometimes occurred to me that Slavery in our country is like the image in Nebuchadnezzar's dream, whose feet of clay are in the District of Columbia, where they may be shivered by Congressional legislation, directed by an enlightened Northern sentiment, so that the whole image shall tumble to the earth. Other measures against Slavery are sanctioned by the Massachusetts Whigs, and by the Legislature of our State, in formal resolutions, duly transmitted to Washington. I have never heard of Mr. Winthrop's voice for any of these,—nor, judging by the past, have I any reason to believe that he will support them earnestly. On these important points he fails, if tried by Whig standards.

Will he oppose, at all times, without compromise, any further addition of slaveholding States? Here again, if we judge him by the past, he is wanting. None can forget that in 1845, on the Fourth of July, a day ever sacred to memories of Freedom, in a speech at Faneuil Hall, he volunteered, in advance of any other Northern Whig, to receive Texas with a welcome into the family of States, although on that very day she was preparing a Constitution placing Slavery beyond the reach of legislative change.