Mr. Curtis correctly says that a great majority of Mr. Webster's constituents, if not of the whole North, disapproved this speech. He might have added that that majority has steadily increased. The popular verdict has been given against the 7th of March speech, and that verdict has passed into history. Nothing can now be said or written which will alter the fact that the people of this country who maintained and saved the Union have passed judgment upon Mr. Webster and condemned what he said on the 7th of March, 1850, as wrong in principle and mistaken in policy. This opinion is not universal,--no opinion is,--but it is held by the great body of mankind who know or care anything about the subject, and it cannot be changed or substantially modified, because subsequent events have fixed its place and worth irrevocably. It is only necessary, therefore, to examine very briefly the grounds of this adverse judgment, and the pleas put in against it by Mr. Webster and by his most devoted partisans. From the sketch which has been given of Mr. Webster's course on the slavery question, we see that in 1819 and 1820 he denounced in the strongest terms slavery and every form of slave-trade; that while he fully admitted that Congress had no power to touch slavery in the States, he asserted that it was their right and their paramount duty absolutely to stop any further extension of slave territory. In 1820 he was opposed to any compromise on this question. Ten years later he stood out to the last, unaffected by defeat, against the principle of compromise which sacrificed the rights and the dignity of the general government to the resistance and threatened secession of a State. After the reply to Hayne in 1830, Mr. Webster became a standing candidate for the presidency, or for the Whig nomination to that office. From that time forth, the sharp denunciation of slavery and traffic in slaves disappears, although there is no indication that he ever altered his original opinion on these points; but he never ceased, sometimes mildly, sometimes in the most vigorous and sweeping manner, to attack and oppose the extension of slavery to new regions, and the increase of slave territory. If, then, in the 7th of March speech, he was inconsistent with his past, such inconsistency must appear, if at all, in his general tone in regard to slavery, in his views as to the policy of compromise, and in his attitude toward the extension of slavery, the really crucial question of the time.