534 LAWS OF MARYLAND.

walls, smoke flues, fireplaces, hot-air flues, boilers, kettles,
smoke stacks and stove pipes in said districts, and the storage
of gasoline and other combustibles or explosives therein; to
provide for and regulate the safe construction, inspection and
repair of all private and public buildings within said dis-
tricts ; to regulate, restrain or prohibit, in their discretion, the
erection of wooden or frame buildings within the present limits
of said districts or any thickly populated portion of the same,
and to remove the same at the owner's expense, when erected
or suffered to remain contrary to law or such regulations as
they may adopt; to regulate the height, construction and in-
spection of all new buildings hereafter erected in said dis-
tricts; to regulate the limits within which it shall be lawful to
erect steps, porticoes, bay windows or other structural orna-
ments to nouses fronting on any of the highways, streets,
avenues, lanes or alleys of said districts, and generally to adopt
and enforce for the whole of said districts or for thickly popu-
lated portions thereof, all necessary regulations or rules for
the aforegoing purposes, and to prescribe fines and penalties
for violations thereof; provided, however, that no such rules
and regulations so adopted by said County Commissioners as
aforesaid shall be deemed valid or effective until the same shall
have been formally adopted by the said County Commissioners
at a regular meeting, and recorded in a book kept in their
office for the purpose, and until said rules and regulations shall
have been published at least three times in two of the county
papers published in Baltimore county; and it shall be the duty
of the County Commissioners to cause said rules and regula-
tions adopted by them as aforesaid to be so recorded in a book
or books kept by them for that purpose in their office, and to
be published at least three times in two papers published in
Baltimore county as aforesaid, and when so recorded and pub-
lished all persons shall be deemed and taken to have notice
thereof, and no actual notice need be proven. And it shall
further be the duty of the said County Commissioners to cause
to be printed for general distribution a sufficient number of
copies of said rules and regulations when so adopted, recorded
and published as aforesaid, with a printed certificate, by the
chief clerk of said County Commissioners, to the effect that
said rules and regulations have been so recorded and published
as aforesaid, and said printed copy of such regulations, with
certificate as aforesaid, shall be deemed prima facie evidence
of such rules and regulations whenever it may be necessary to
prove the existence of the same in any judicial proceedings.
And the power is given said County Commissioners to change
or amend .from time to time, as may be necessary, such rules