Arabella Anderson was the daughter of James McL. and Arabella Moreland Anderson, who emigrated from Belfast about 1847. They settled at Waterford, New York, and promptly identified themselves with the Presbyterian Church. They brought an infant son with them; another son and three daughters were born to them in their new home. Arabella was the eldest daughter, having been born Nov. 26, 1848. After elementary instruction in the local school she spent a year in a nearby academy. At the age of twelve she united with the Church. Her desire to become a foreign missionary was largely the fruit of home influence. Both parents were devoted to the cause of missions. Her father never forgot to intercede for the work at family prayers. Her mother had been quickened in zeal for the work in youth by hearing a missionary to Russia; and it was her hope that her first born son might become a missionary, though circumstances prevented this. In the summer of 1872 Mrs. S. R. House was at her old home in Waterford planning to return to Siam for the new enterprise which had been entrusted to her by the “Troy Branch.” The pastor of the local church, Rev. R. P. H. Vail, preached a missionary sermon making a strong appeal for a volunteer to accompany Mrs. House as a missionary-teacher. This came to the heart of Miss Anderson as the Master’s call for enlistment in the work she had long contemplated. After counsel with her mother she offered her services to Mrs. House and was accepted. Two months later, in September, the two sailed for Siam, reaching Bangkok late in the autumn. It was two years before the new boarding school for girls could be housed. In the meantime Miss Anderson took charge of the younger children in the day school of the mission.