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Correspondence, notes, and manuscripts including items that relate to most of Agnew's professional activities, are especially rich in materials that deal with the treatment of eye diseases during the latter half of the 19th century. An interesting sidelight of the collection is a group of finely detailed woodblocks and steel plates that Agnew used to illustrate his published articles.

Letters written to Mackintosh chiefly on scientific subjects, from his colleagues including Thomas Sterry Hunt (1826-1892), 37; William Earl Hidden (1853-1918), 50; Thomas Egleston (1832-1900), founder of the School of Mines, Columbia University, 10; R.S. Penniman, 26; and Pierre Eugene Marcelin Berthelot (1827-1907), eminent French chemist, 1. Also, miscellaneous documents relating to Mackintosh and about fifteen printed articles and brochures.

Professional correspondence of Egleston, consisting of incoming letters and technical reports relating to mining engineering and metallurgy; and carbon copies of correspondence between Egleston and Seth Low for the years 1890 to 1900.