There are four bundles containing: one letter written by Dorothy Isaac, copies of letters written by Dorothy Isaac, copies of letters written by Mr.and Mrs.T.H. Wilson, verse written by Mr.T.H.Wilson and a printed map of the area. Most of the letters were probably copied by Mrs. Isaac, Dorothy Isaac's mother, who numbered them and added notes about them.
Dorothy Isaac describes her journey from England to Inkongo as well as, on arrival, the missionary work, teaching work in the pharmacy, illnesses suffered by the missionaries and the local people, contact with American Presbyterian missionaries at Lusambo, Belgian Traders, the native way of life, customs and fetishes, insects, wildlife and plant-life and the climate.