Letter written by Whitney from Lihue, Kauai, dated February 2, 1855, to his mother Elizabeth Ann Whitney with news of his travels and missionary activities, as well as expressions of affection.

Letter written by Whitney from Lihue, Kauai, dated March 15, 1855, to his brother Horace K. Whitney regarding his study of the Hawaiian language, his missionary labors and experiences, conditions in Hawaii, and his desire to receive letters from his family and friends.

Letter written by Whitney from Koloa, Kauai, dated May 9, 1855, to his brother Horace K. Whitney regarding conditions among the native Hawaiians, his effort to master the language, and his personal feelings.

Letter written by Whitney from Kilawoli, Kauai, dated June 30, 1855, to his sister Anna Maria Whitney regarding his desire to receive letters from home, counsel regarding dating and association with those who were not members of the Church, and observations on the world and the people of California.

Letter written by Whitney from Honolulu, Oahu, dated July 13, 1855, to his wife Joanna Whitney regarding his arrival in Honolulu from the island of Kauai and mission news. On the same sheet, includes a letter from John T. Caine to "Dear Friends," with apparent reference to the Whitney family, also dated July 13, 1855, with news of the mission and expressions of gratitude to the Whitney family.

Letter written by Whitney from Honolulu, Oahu, dated October 7, 1856, to his wife Joanna Whitney regarding his life as a missionary and the arrival of new missionaries from Utah.

Letter written by Whitney from Honolulu, Oahu, dated October 6, 1856, to his wife Joanna in Salt Lake City, Utah. He discusses his personal feelings about her and his work as a missionary, his anticipation of his return home, and personal and family matters.