File consists of Jarrell's incoming and copies of outgoing correspondence and memoranda pertaining to his academic research and teaching, his work as editor and publisher of the Scientia Canadensis, and his involvement with the Canadian Science and Technology Historical Association (CSTHA). Correspondents include A.W. Tickner, Trevor Levere, W.T. Sullivan III, Wendy Mitchinson, James P. Hull, Marianne G. Ainley, Jacques Bernier, Raymond Duchesne, Marilyn Barber, Gregory A. Good, C. David Naylor, Gina Feldberg, Philip Enros, Yves Gingras, Boris Castel, Paul Rux, Wayne Orchiston, Spencer R. Weart, Shelley Hornstein, Tim DeJager, Michael M. Sokal, Robert W. Passfield, W.L. Hine, Jeremy Tatum, Don Osterbrock, Hiroyuki Fujita, Peter J. Bowler.