Effective January 1, 1974, the financial assistance payments under the federal aid categories of old age assistance, disability assistance, and blind assistance provided in chapters
74.08, *74.10, and
74.16 RCW, respectively, and the corresponding provisions of RCW
74.04.005, shall be terminated and superseded by the national program to provide supplemental security income to individuals who have attained age sixty-five or are blind or disabled as established by Public Law 92-603 and Public Law 93-66: PROVIDED, That the agreements between the department of social and health services and the United States department of health, education and welfare receive such legislative authorization and/or ratification as required by **RCW
74.04.630.