This is the bill known as "Mason's Bill," introduced by Mr. Butler of South Carolina, on the 16th of January last. This is the bill which Mr. Webster proposes to support, "with all its provisions to the fullest extent." It is a Bill of abominations, but there are "some amendments to it," which modify the bill a little. Look at them. Here they are. The first provides in addition to the fine of one thousand dollars for aiding and abetting the escape of a fugitive, for harboring and concealing him, that the offender "shall also be imprisoned twelve months." The second amendment is as follows--"And in no trial or hearing under this act shall the testimony of such fugitive be admitted in evidence." These are Mr. Mason's amendments, offered on the twenty-third of last January. This is the bill, "with some amendments," which Mr. Webster says, "I propose to support, with all its provisions, to the fullest extent." Mr. Seward's bill was also before the Senate--a bill granting the fugitive slave a trial by jury in the State where he is found, to determine whether or not he is a slave. Mr. Webster says not a word about this bill. He does not propose to support it. Suppose the bill of Mr. Webster's friend shall pass Congress, what will the action of it be? A slave-hunter comes here to Boston, he seizes any dark-looking man that is unknown and friendless, he has him before the postmaster, the collector of customs, or some clerk or marshal of some United States court, and makes oath that the dark man is his slave. The slave-hunter is allowed his oath. The fugitive is not allowed his testimony. The man born free as you and I, on the false oath of a slave-hunter, or the purchased affidavit of some one, is surrendered to a southern State, to bondage life-long and irremediable. Will you say, the postmaster, the collector, the clerks and marshals in Boston would not act in such matters? They have no option; it is their official business to do so. But they would not decide against the unalienable rights of man--the right to life, liberty, and the pursuit of happiness. That may be, or may not be. The slave-hunter may have his "fugitive" before the collector of Boston, or the postmaster of Truro, if he sees fit. If they, remembering their Old Testament, refuse to "bewray him that wandereth," the slave-hunter may bring on his officer with him from Georgia or Florida; he may bring the custom-house officer from Mobile or Wilmington, some little petty postmaster from a town you never heard of in South Carolina or Texas, and have any dark man in Boston up before that "magistrate," and on his decision have the fugitive carried off to Louisiana or Arkansas, to bondage for ever. The bill provides that the trial may be had before any such officer, "residing or being" in the State where the fugitive is found!