You all remember, fellow citizens, the wide-spread excitement which a few years since prevailed on the subject of SUNDAY MAILS. Instead of attempting to quiet the agitation, by outraging the rights of the petitioners, Congress referred the petitions to a committee, and made no attempt to stifle discussion.

Why, then, we ask, with such authorities and precedents before them, do the slaveholders in Congress, regardless of their oaths, strive to gag the friends of freedom, under pretence of allaying agitation? Because conscience does make cowards of them all—because they know the accursed system they are upholding will not bear the light—because they fear, if these petitions are discussed, the abominations of the American slave trade, the secrets of the prison-houses in Washington and Alexandria, and the horrors of the human shambles licensed by the authority of Congress, will be exposed to the score and indignation of the civilized world.

Unquestionably the late RULE surpasses, in its profligate contempt of constitutional obligation, any act in the annals of the Federal Government. As such it might well strike every patriot with dismay, were it not that attending circumstances teach us that it is the expiring effort of desperation. When we reflect on the past subserviency of our northern representatives to the mandates of the slaveholders, we may well raise, on the present occasion, the shout of triumph, and hail the vote on the recent RULE as the pledge of a glorious victory. Suffer us to recall to your recollection the majorities by which the successive attempts to crush the right of petition and the freedom of debate have been carried.

Pinckney's Gag was passed May, 1836, by a majority of 51
Hawes's do. Jan. 1837, 58
Patton's do. Dec. 1837, 48
Atherton's do. Dec. 1838, 48
JOHNSON's do. Jan. 1840, 6

Surely, when we find the majority against us reduced from 58 to 6, we need no new incentive to perseverance.

Another circumstance which marks the progress of constitutional liberty, is the gradual diminution in the number of our northern serviles. The votes from the free States in favor of the several gags were as follows:—

For Pinckney's 62
For Hawes's 70
For Patton's 52
For Atherton's 49
For JOHNSON's 28

There is also another cheering fact connected with the passage of the RULE which deserves to be noticed. Heretofore the slaveholders have uniformly, by enforcing the previous question, imposed their several gags by a silent vote. On the present occasion they were twice baffled in their efforts to stifle debate, and were, for days together, compelled to listen to speeches on a subject which they have so often declared should not be discussed.

A base strife for southern votes has hitherto, to no small extent, enlisted both the political parties at the north in the service of the slaveholders. The late unwonted independence of northern politicians, and the deference paid by them to the wishes of their own constituents, in preference to those of their southern colleagues, indicates the advance of public opinion. No less than 49 northern members of the administration party voted for the Atherton gag, while only 27 dared to record their names in favor of Johnson's; and of the representation of SIX States, every vote was given against the rule, without distinction of party. The tone in which opposite political journals denounce the late outrage may warn the slaveholders that they will not much longer hold the north in bonds. The leading administration paper in the city of New York regards the RULE with "utter abhorrence;" while the official paper of the opposition, edited by the state printer, trusts that the names of the recreant northerners who voted for it may be "handed down to eternal infamy and execration."

The advocates of abolition are no longer consigned to unmitigated contempt and obloquy. Passing by the various living illustrations of our remark, we appeal for our proofs to the dead. The late WILLIAM LEGGETT, the editor of a Democratic Journal in the city of New York, was denounced, in 1835, by the "Democratic Republican General Committee," for his abolition doctrines. Far from faltering in his course, on account of the censure of his own party, he exclaimed, with a presentiment almost amounting to prophecy, "The stream of public opinion now sets against us, but it is about to turn, and the regurgitation will be tremendous. Proud in that day may well be the man who can float in triumph on the first refluent wave, swept onward by the deluge which he himself, in advance of his fellows, had largely shared in occasioning. Such be my fate; and, living or dying, it will in some measure be mine. I have written my name in ineffaceable letters on the abolition record." And he did live to behold the first swelling of the refluent wave. The denounced abolitionist was honored by a democratic President with a diplomatic mission; and since his death, the resolution condemning him has been EXPUNGED from the minutes of the democratic committee.