Mr. Webster, before Mr. Calhoun had resumed his seat, or he had risen from his own, accepted the challenge, and commenced his reply. He began to speak as he was rising, and continued to address the Senate with great force and effect, for about two hours. The Senate then took a recess, and after it came together Mr. Webster spoke again, from five o'clock till eight in the evening. The speech was more purely a constitutional argument than that of the 26th of January, 1830. It was mainly devoted to an examination of Mr. Calhoun's resolutions; to a review of the adoption and ratification of the Constitution of the United States, by way of elucidating the question whether the system provided by the Constitution is a government of the people or a compact between the States; and to a discussion of the constitutionality of the tariff. It was less various and discursive in its matter than the speech on Foot's resolution, but more condensed and systematic. Inferior, perhaps, in interest for a mixed audience, from the absence of personal allusions, which at all times give the greatest piquancy to debate, a severe judgment might pronounce it a finer piece of parliamentary logic. Nor must it be inferred from this description that it was destitute of present interest. The Senate-chamber was thronged to its utmost capacity, both before and after the recess, although the streets of Washington, owing to the state of the weather at the time, were nearly impassable. The opinion entertained of this speech by the individual who, of all the people of America, was the best qualified to estimate its value, may be seen from the following letter of Mr. Madison, which has never before been published. "_Montpellier, March 15th, 1833._ "MY DEAR SIR:--I return my thanks for the copy of your late very powerful speech in the Senate of the United States. It crushes 'nullification,' and must hasten an abandonment of 'secession.' But this dodges the blow, by confounding the claim to secede at will with the right of seceding from intolerable oppression. The former answers itself, being a violation without cause of a faith solemnly pledged. The latter is another name only for revolution, about which there is no theoretic controversy. Its double aspect, nevertheless, with the countenance received from certain quarters, is giving it a popular currency here, which may influence the approaching elections both for Congress and for the State legislature. It has gained some advantage also by mixing itself with the question, whether the Constitution of the United States was formed by the people or by the States, now under a theoretic discussion by animated partisans.