Section 16. The act, approved March 30, 1903 (P.L.106), entitled "An act authorizing and empowering the city treasurers of the several cities of second class and third class of this Commonwealth to sell at public sale all properties upon which the taxes, assessed and levied, are delinquent and remain unpaid," and its amendments, are hereby repealed in so far as they relate to cities of the second class A.