ART. 23] HEARINGS——WITNESSES——PROCEEDINGS. 725

such person, and such person shall be given an opportunity to be heard;
and if the judge shall determine that such person has refused, without
reasonable cause or legal excuse, to be examined or to answer a legal
and pertinent question, or to produce a book or paper which he was
ordered to bring or produce, he may forthwith commit the offender to
jail, there to remain until he submits to do the act which he was so
required to do, or is discharged according to law.

1910, ch. 180, sec. 10 (p. 353).

422. All hearings before the commission or commissioner shall be
governed by rules to be adopted and prescribed by the commission. And
in all investigations, inquiries or hearings the commission, or a com-
missioner, shall not be bound by the technical rules of evidence. No
person shall be excused from testifying or from producing any books
or papers in any investigation or inquiry by or upon any hearing before
the commission or any commissioner, when ordered to do so by the
commission, upon the ground that the testimony or evidence, books or
documents required of him may tend to incriminate him or subject him
to penalty or forfeiture; but no person shall be prosecuted, punished
or subjected to any penalty or forfeiture for or on account of any act,
transaction, matter or thing concerning which he shall, under oath,
have, by order of the commission or a commissioner, testified or pro-
duced documentary evidence; provided, however, that no person so
testifying shall be exempt from prosecution or punishment for any
perjury committed by him in his testimony. Nothing herein contained
is intended to give, or shall be construed as in any manner giving unto
any corporation immunity of any kind from the law.

1910, ch. 180, sec. 11 (p. 353).

423. After an order has been made by the commission, any party
interested therein may apply for a rehearing in respect to any matter
determined therein, and the commission may grant and hold such a
rehearing if, in its judgment, sufficient reason therefor be made to
appear; if a rehearing shall be granted, the same shall be determined
by the commission within thirty days after the same shall be finally
submitted. Any application for such a rehearing shall not excuse any
common carrier, railroad corporation, or street railroad corporation, or
any other corporation or company or person, subject to any of the
provisions of this sub-title, from complying with or obeying any order,
or any requirements of any order of the commission, to operate in any
manner to stay or postpone the enforcement thereof, except as the com-
mission may by order direct. If, after such rehearing and considera-
tion of the facts, including those arising since the making of the
order, the commission shall be of opinion that the original order, or
any part thereof, is in any respect unjust or unwarranted, the commis-
sion may abrogate, change or modify the same. An order made for
any such rehearing, abrogating, changing or modifying the original
order shall have the same force and effect as an original order.