| On the Construction of a Silvered Glass Telescope / Fifteen and a half inches in aperture, and its use in celestial photography
Henry Draper | |
| On the Construction of Catalogues of Libraries and Their Publication by Means of Separate, Stereotyped Titles / With Rules and Examples
Charles C. Jewett | |
| On the Cross: A Romance of the Passion Play at Oberammergau
Wilhelmine von Hillern | |
| On the Curability of Certain Forms of Insanity, Epilepsy, Catalepsy, and Hysteria in Females
Isaac Baker Brown | |
| On the Decay of the Art of Lying
Mark Twain | |
| On the Development and Distribution of Primitive Locks and Keys
Augustus Henry Lane-Fox Pitt-Rivers | |
| On the Duty of Civil Disobedience
Henry David Thoreau | |
| On the Economy of Machinery and Manufactures
Charles Babbage | |
| On the Edge of the Arctic; Or, An Aeroplane in Snowland
H. L. Sayler | |
| On the Edge of the Primeval Forest / Experiences and Observations of a Doctor in Equatorial Africa
Albert Schweitzer |
