Mr. Lincoln's audience was a notable one even for New York. It included William Cullen Bryant, who introduced him; Horace Greeley, David Dudley Field, and many more well known men of the day. It is doubtful if there were any persons present, even his best friends, who expected that Lincoln would do more than interest his hearers by his sound arguments. Many have confessed since that they feared his queer manner and quaint speeches would amuse people so much that they would fail to catch the weight of his logic. But to the surprise of everybody Lincoln impressed his audience from the start by his dignity and his seriousness. "His manner was, to a New York audience, a very strange one, but it was captivating," wrote an auditor. "He held the vast meeting spellbound, and as one by one his oddly expressed but trenchant and convincing arguments confirmed the soundness of his political conclusions, the house broke out in wild and prolonged enthusiasm. I think I never saw an audience more thoroughly carried away by an orator." The Cooper Union speech was founded on a sentence from one of Douglas's Ohio speeches:--"Our fathers when they framed the government under which we live understood this question just as well, and even better, than we do now." Douglas claimed that the "fathers" held that the Constitution forbade the Federal government controlling slavery in the Territories. Lincoln with infinite care had investigated the opinions and votes of each of the "fathers"--whom he took to be the thirty-nine men who signed the Constitution--and showed conclusively that a majority of them "certainly understood that no proper division of local from Federal authority nor any part of the Constitution forbade the Federal government to control slavery in the Federal Territories." Not only did he show this of the thirty-nine framers of the original Constitution, but he defied anybody to show that one of the seventy-six members of the Congress which framed the amendments to the Constitution ever held any such view. "Let us," he said, "who believe that 'our fathers who framed the government under which we live understood this question just as well, and even better, than we do now,' speak as they spoke, and act as they acted upon it. This is all Republicans ask--all Republicans desire--in relation to slavery. As those fathers marked it, so let it be again marked, as an evil not to be extended, but to be tolerated and protected only because of and so far as its actual presence among us makes that toleration and protection a necessity. Let all the guaranties those fathers gave it be not grudgingly, but fully and fairly, maintained. For this Republicans contend, and with this, so far as I know or believe, they will be content."