Exploration of areas along Gila and Colorado rivers by fray Garces who affirms peoples are of same language and physical build but have become separate due to wars. Affirms Opas better at agriculture than Yumas. Describes best places to establish missions. Arrives at lagoon where Talchedunes have large settlement near Colorado River. Describes seed named equiesa which is utilized to make bread and atole. Garces sends letter to missions in New Mexico with old yabapai hoping it will arrive one day. Returns to Tubac by route used by Ansa on his way back from California. (A. Dell'aqua, 1/87)