I had asked this same question before and this is the reply I got and saved! FIRST CLASS HEADRIGHT GRANTS Issued to those who arrived before March 2, 1836. Heads of families received one league (4428 acres) and one labor (177.1 acres), while single men received 1/3 league (1,476.1 acres). SECOND CLASS HEADRIGHT GRANTS Issued to those who arrived between March 2, 1836 and October 1, 1837. Heads of families received 1280 acres, while single men received 640 acres. THIRD CLASS HEADRIGHT GRANTS Issued to those who arrived between October 1, 1837 and January 1, 1840. Heads of families received 640 acres and single men received 320 acres FOURTH CLASS HEADRIGHT GRANTS Issued to those who arrived between January 1, 1840 and January 1, 1842. The amounts issued were the same as for Third Class grants, plus the requirement of cultivation of 10 acres. This information is from the "Archives and Records Division" of the Texas General Land Office