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time agreed upon. If at any time such methods and applicances appear
inadquate, the engineer may order the contractor to improve their
character or increase their efficiency, and the contractor must con-
form to such order; but the failure of the engineer to order such
improvements of methods or increase of efficiency will not relieve
the contractor from his obligations to perform good work and to
finish it in the time agreed upon.

13. SAMPLES OR SPECIMENS.- The contractor shall submit
samples or specimens of any or all materials proposed to be used
in the work if required to so so by the engineer.

14. MATERIALS AND WORKMANSHIP.- All materials must be of
the specified quality and fully equal to approved samples when samples
are required. All work must be done and completed in a thorough
workmanlike manner by mechanics skilled in their various trades, not-
withstanding any ommission from the specifications or drawings. All
material furnished and all work done must be satisfactory to the
engineer and will be subject to rigid inspection, and if not in
accordance with the specifications, in the opinion of the engineer,
shall be immediately removed from the vicinity of the work at the
cost of the contractor.

15. Extension of time will be allowed for unavoidable
delays that may result from unforeseen causes, that in the opinion of
the engineer approved by the Mayor and Board of Commissioners, are
undoubtedly beyond the control of the contractor. If the work is
delayed by specific orders to stop work given by the Mayor and Board
of Commissioners or by the engineer, or if any delay or hindrance
is caused by the performance of extra work duly ordered by them, then
such delay will entitle the contractor to an extension of time equiva-
lent to the time lost by such delay. Any extension of time, however,
shall not release the sureties from their obligations, which shall
remain in full force and effect until the discharge of the contract.

16. SUSPENSION OF CONTRACT.- Should the contractor fail to
begin the work within the time required, or fail to begin the deliv-