of Parliamentary proceedings, the Managers for this House have ever since considered it as an indispensable duty to assert the same principle, in all its latitude, upon all occasions on which it could come in question,—and to assert it with an energy, zeal, and earnestness proportioned to the magnitude and importance of the interest of the Commons of Great Britain in the religious observation of the rule, that the Law of Parliament, and the Law of Parliament only, should prevail in the trial of their impeachments.

In the year 1715 (1 Geo. I.) the Commons thought{22} proper to impeach of high treason the lords who had entered into the rebellion of that period. This was about six years after the decision in the case of Sacheverell. On the trial of one of these lords, (the Lord Wintoun,[13]) after verdict, the prisoner moved in arrest of judgment, and excepted against the impeachment for error, on account of the treason therein laid "not being described with sufficient certainty,—the day on which the treason was committed not having been alleged." His counsel was heard to this point. They contended, "that the forfeitures in cases of treason are very great, and therefore they humbly conceived that the accusation ought to contain all the certainty it is capable of, that the prisoner may not by general allegations be rendered incapable to defend himself in a case which may prove fatal to him: that they would not trouble their Lordships with citing authorities; for they believed there is not one gentleman of the long robe but will agree that an indictment for any capital offence to be erroneous, if the offence be not alleged to be committed on a certain day: that this impeachment set forth only that in or about the months of September, October, or November, 1715, the offence charged in the impeachment had been committed." The counsel argued, "that a proceeding by impeachment is a proceeding at the Common Law, for Lex Parliamentaria is a part of Common Law, and they submitted whether there is not the same certainty required in one method of proceeding at Common Law as in another."

The matter was argued elaborately and learnedly, not only on the general principles of the proceedings{23} below, but on the inconvenience and possible hardships attending this uncertainty. They quoted Sacheverell's case, in whose impeachment "the precise days were laid when the Doctor preached each of these two sermons; and that by a like reason a certain day ought to be laid in the impeachment when this treason was committed; and that the authority of Dr. Sacheverell's case seemed so much stronger than the case in question as the crime of treason is higher than that of a misdemeanor."

Here the Managers for the Commons brought the point a second time to an issue, and that on the highest of capital cases: an issue, the event of which was to determine forever whether their impeachments were to be regulated by the law as understood and observed in the inferior courts. Upon the usage below there was no doubt; the indictment would unquestionably have been quashed. But the Managers for the Commons stood forth upon this occasion with a determined resolution, and no less than four of them seriatim rejected the doctrine contended for by Lord Wintoun's counsel. They were all eminent members of Parliament, and three of them great and eminent lawyers, namely, the then Attorney-General, Sir William Thomson, and Mr. Cowper.

Mr. Walpole said,—"Those learned gentlemen [Lord Wintoun's counsel] seem to forget in what court they are. They have taken up so much of your Lordships' time in quoting of authorities, and using arguments to show your Lordships what would quash an indictment in the courts below, that they seemed to forget they are now in a Court of Parliament, and on an impeachment of the Commons of Great Britain. For, should the Commons admit all that they have offered,{24} it will not follow that the impeachment of the Commons is insufficient; and I must observe to your Lordships, that neither of the learned gentlemen have offered to produce one instance relative to an impeachment. I mean to show that the sufficiency of an impeachment was never called in question for the generality of the charge, or that any instance of that nature was offered at before. The Commons don't conceive, that, if this exception would quash an indictment, it would therefore make the impeachment insufficient. I hope it never will be allowed here as a reason, that what quashes an indictment in the courts below will make insufficient an impeachment brought by the Commons of Great Britain."

The Attorney-General supported Mr. Walpole in affirmance of this principle. He said,—"I would follow the steps of the learned gentleman who spoke before me, and I think he has given a good answer to these objections. I would take notice that we are upon an impeachment, not upon an indictment. The courts below have set forms to themselves, which have prevailed for a long course of time, and thereby are become the forms by which those courts are to govern themselves; but it never was thought that the forms of those courts had any influence on the proceedings of Parliament. In Richard II.'s time, it is said in the records of Parliament, that proceedings in Parliament are not to be governed by the forms of Westminster Hall. We are in the case of an impeachment, and in the Court of Parliament. Your Lordships have already given judgment against six upon this impeachment, and it is warranted by the precedents in Parliament; therefore we insist that the articles are good in substance."{25}

Mr. Cowper.—"They [the counsel] cannot but know that the usages of Parliaments are part of the laws of the land, although they differ in many instances from the Common Law, as practised in the inferior courts, in point of form. My Lords, if the Commons, in preparing articles of impeachment, should govern themselves by precedents of indictments, in my humble opinion they would depart from the ancient, nay, the constant, usage and practice of Parliament. It is well known that the form of an impeachment has very little resemblance to that of an indictment; and I believe the Commons will endeavor to preserve the difference, by adhering to their own precedents."

Sir William Thomson.—"We must refer to the forms and proceedings in the Court of Parliament, and which must be owned to be part of the law of the land. It has been mentioned already to your Lordships, that the precedents in impeachments are not so nice and precise in form as in the inferior courts; and we presume your Lordships will be governed by the forms of your own court, (especially forms that are not essential to justice,) as the courts below are by theirs: which courts differ one from the other in many respects as to their forms of proceedings, and the practice of each court is esteemed as the law of that court."

The Attorney-General in reply maintained his first doctrine. "There is no uncertainty; in it that can be to the prejudice of the prisoner: we insist, it is according to the forms of Parliament: he has pleaded to it, and your Lordships have found him guilty."

The opinions of the Judges were taken in the House of Lords, on the 19th of March, 1715, upon two questions which had been argued in arrest of judgment,{26} grounded chiefly on the practice of the courts below. To the first the Judges answered,—"It is necessary that there be a certain day laid in such indictments, on which the fact is alleged to be committed; and that alleging in such indictments that