Letter from Charles A. Brinley to B.J. Harrington, written from Philadelphia.
Letter from collector Clarance S. Bement to Prof. O. D. Allen of the Sheffield Scientific School of Yale University regarding prisms he would like to acquire.
Letter from Edgar F. Smith to B.J. Harrington, written from Philadelphia.
Letter from E.R. Craven
Letter from George F. Barker, written from Philadelphia.
Letter from John Birkriebrie to B.J. Harrington, written from Philadelphia.
Letter from Persifor Frazer to B.J. Harrington, written from Philadelphia.
Letter from Wm.D. Marks to B.J. Harrington, written from St. John (N.B.).