HEALTH. 157

shall constitute a Board of Commissioners, which shall be
known and designated as "The State Board of Commissioners
of Practical Plumbing," and who shall be selected as follows:
Three persons who are practical and skilled plumbers from the
City of Baltimore, the Commissioner of Health of Baltimore
City, and a member of the State Board of Health from the
State at large, whose duty it shall be to faithfully and impar-
tially execute, or cause to be executed, all the provisions and
requirements of this subdivision of this Article; upon applica-
tion and at such place or places in this State as they may de-
termine, provided at least once in each year the examination
shall be held in Baltimore City, they shall examine each and
every person who shall desire to work at the plumbing busi-
ness, touching his competency and qualifications; and, upon
being satisfied that the person so examined is competent and
qualified to work at said business, they, or any three of them,
shall grant to such a person a certificate of competency and
register him in their books as a practical plumber, which shall
operate as full authority to him to work at, conduct and en-
gage in the said plumbing business for the period for which
such certificate shall be granted, and such certificate may be
called or designated by said board a "Master Plumber's Certifi-
cate."

187. The said Board of Commissioners shall demand and re-
ceive from such applicant for a certificate of competency whom
they examine and pass, the sum of three dollars at the time of
the issuance of said certificate, and the sum of one dollar for
the renewal thereof each and every year thereafter, on or be-
fore the first day of May, and said board at any time may re-
quire on any application for renewal any applicant to pass
another examination before issuing any renewal, or may issue
any renewal without requiring any other examination, as said
board in each case from year to year may deem proper.

188. The money received under the provisions of the fore-
going section shall be used and applied by said Commissioners
to pay their compensation and all their expenses, including
such reasonable expenses, costs and fees as they may incur, and
which they are hereby authorized to incur out of the money
so received by them, in investigating any alleged violations of
the provisions of this sub-title and in aiding in the prosecution
or procuring testimony to aid in the prosecution of any alleged
violations of any of the provisions of this sub-title, and in gen-
erally enforcing and making effective the provisions of this sub-
title; and all surplus over and above their compensation and
their expenditures as hereinbefore and hereinafter provided
shall be paid to the State Treasurer for the use of the State.

189. Said Commissioners shall hold their several offices for