The first five Sisters came with Mother Delphine Hart in response to a request from the Jesuit parish priest, Fr. Martin Jacques (1835-1890). They began the school with 35 pupils in a small bungalow near the presbytery. Boys and girls were admitted at first. Later the present property was acquired, and in 1885 a boarding school for girls only was started in a three-story building facing the railway tank. The top floor was damaged by the 1897 Assam earthquake and had to be demolished leaving the present two stories. Between 1909 and 1928 other wings were added for classrooms and dormitories. The students were prepared for the Junior and Senior Cambridge examinations.