A land grant system in the early Republic of Texas in which four contracts were made to designate "colonies" and bring immigrants to the Texas frontier. Contractors were to receive 10 sections of land for each 100 colonists introduced and up to half of the colonists' grants. Colonists were to receive grants similar in amount and requirements to fourth class headrights(a status issued to those who arrived to Texas between January 1, 1840 and January 1, 1842.), with the requirement of placing 15 acres into cultivation. The four colonies were Peters' Colony, Fisher and Miller's Colony, Mercer's Colony, and Castro's Colony.