The fonds contains documents pertaining to his religious life including his baptism certificate, a Latin letter from Father Dufresne confirming his ordination, photocopies of mission dates and information, an Upper Canada Province newsletter featuring him, and prayer cards. Additionally, the fonds contains a number of photograph portraits of Father Howitt at various missions, many which feature Indigenous community members, and one negative. A number of correspondence can also be found in the fonds, most of which was produced from the 1920s to 1940s at Spanish, Ontario, as well as Cape Croker, Port Arthur, and Nipigon, and which reports on his mission work.

The fonds contains correspondence from the 1870s and 1880s written by Pierre Hamel, S.J. mostly addressed to other Jesuits at Immaculée-Conception in Montreal. Two photograph portraits of Father Hamel, a small hand-painted booklet dedicated to Father Hamel from a school, and an official 1887 Jesuit document (written in Latin) can also be found in the fonds.