The Oregon Territory, Its History and Discovery
Oregon and Eldorado; or, Romance of the Rivers
The Open Secret of Ireland
On Yachts and Yacht Handling
On the Study of Zoology
On the Relations of Man to the Lower Animals
On the Red Chalk of England
On the Reception of the 'Origin of Species'
On the Nature of Things
On the Method of Zadig
On the Choice of Books
On the Advisableness of Improving Natural Knowledge
On Some Fossil Remains of Man
On Old-World Highways
On Land and Sea at the Dardanelles
On Heroes, Hero-Worship, and the Heroic in History