After having been scrutinized and approved by parliamentary officials known as Examiners of Petitions for Private Bills, a private bill is introduced in one of the two houses.[202] Its introduction is equivalent to its first reading. At its second reading debate may take place upon the principle of the measure, after which the bill, if opposed, is referred to a Private Bill Committee consisting of four members and a disinterested referee. If the bill be not opposed, i.e., if no adverse petition has been filed by property owners, corporations, or other interests, the committee of reference, under a standing order of 1903, consists of the Chairman and Deputy Chairman of Ways and Means, two other members of the House, appointed by (p. 138) the Committee of Selection, and the Counsel to Mr. Speaker. The committee stage of a contested bill assumes an essentially judicial aspect. Promoters and opponents are represented by counsel, witnesses are examined, and expert testimony is taken. After being reported by committee, the measure goes its way under the same regulations as those controlling the progress of public bills. [Footnote 202: To facilitate their consideration, such measures are distributed approximately equally between the two houses. This is done through conference of the Chairmen of Committees of the two houses, or their counsel, prior to the assembling of Parliament.] *145. Provisional Orders.*--Two things are, however, to be noted. The first one is that while in theory the distinction between a public and a private bill is clear, in point of fact there is no little difficulty in drawing a line of demarcation, and the result has been the recognition of an indefinite class of "hybrid" bills, partly public and partly private in content and handled under some circumstances as the one and under others as the other, or even under a procedure combining features of both. The second fact to be observed is that, in part to reduce expense and in part to procure the good-will of the executive department concerned, it has become common for the promoters of enterprises requiring parliamentary sanction to make use of the device known as provisional orders. A provisional order is an order issued, after minute investigation, by a government department authorizing provisionally the undertaking of a project in behalf of which application has been made. It requires eventually the sanction of Parliament, but such orders are laid before the houses in groups by the several departments and their ratification is virtually assured in advance. It is pointed out by Lowell that during the years 1898-1901 not one-tenth of the provisional orders laid before Parliament were opposed, and but one failed of adoption.[203]