The Mississippi Old Age Security Law is continued in force in pursuance of Public Law 92-603, 92nd Congress, under Title III thereof establishing supplemental security income for the aged, blind and disabled; and under Title VI thereof providing grants to the several states for services to the aged, blind or disabled to help needy individuals who are sixty-five (65) years of age or over, are blind, or are disabled to attain or retain capability for self-support or self-care under plans approved by the secretary of health, education and welfare, for services to the aged, blind or disabled; to continue the administration of aid to families with dependent children, pursuant to Title IV, federal Social Security Act, and Sections 43-17-1 through 43-17-25; to determine the eligibility of needy persons for food stamps from the U. S. Department of Agriculture or other federal agency, thus enabling the state to make more adequate provisions for needy aged, blind or disabled persons and for families with dependent children by reason of said federal grants therein provided, the state being unable financially to provide such services and assistance without such federal aid. Therefore, in the event that Public Law 92-603, 92nd Congress, or Title IV, federal Social Security Act, should be finally adjudged invalid, or in the event that the federal grants-in-aid provided thereunder should be substantially reduced below fifty percent (50%), then and in either of such events, and upon public proclamation of the governor, the Mississippi Old Age Security Law shall ipso facto be thereby repealed and rendered null and void.