8. The Minister shall call for tenders by public advertisement for the execution of all works done by contract and the estimated cost of which exceeds twenty-five thousand dollars, except in cases of emergency, where delay would be injurious to the public interest, or where, from the nature of the work to be performed, it could be more expeditiously and economically executed by the officers and servants of the Department.
R. S. 1964, c. 138, s. 8.