This series contains a bound diary of day-to-day accounts of Chapin's expedition to Labrador and Greenland; correspondence of the courtship between Chapin and Isabel "Katie-Belle" Hayes, numbered in chronological order and dating from August 12, 1862 to September 22, 1863 (four days before their wedding); a "Voyage to India" journal kept by the Chapins; field notes, containing handwritten drafts and abstracts of longer works by Chapin and correspondence from missionary colleagues; and correspondence sent and received by both missionaries during their time in the field. Material transcribed and annotated by Mabel Hay Barrows Mussey (daughter of Isabel and Samuel Barrows) is indicated by the initials "MM."