Texas Constitution Article 7, Section 2

PERMANENT SCHOOL FUND. All funds, lands and other property heretofore set apart and appropriated for the support of public schools; all the alternate sections of land reserved by the State out of grants heretofore made or that may hereafter be made to railroads or other corporations of any nature whatsoever; one half of the public domain of the State; and all sums of money that may come to the State from the sale of any portion of the same, shall constitute a permanent school fund. (Feb. 15, 1876. Amended Nov. 8, 2011)