Philosophers

Haeckel : his life and work

Louis Agassiz: His Life and Correspondence

Thomas Paine, the Apostle of Liberty

A Biographical Dictionary of Ancient, Medieval, and Modern Freethinkers

Adam Smith

The Life of Tolstoy: First Fifty Years Fifth Edition

Steve P. Holcombe, the Converted Gambler: His Life and Work

Parallel Lives

Two Years and Four Months in a Lunatic Asylum

Biographical Essays

The Trail of the Tramp

The Life of Hugo Grotius

Letters of Alexander von Humboldt to Varnhagen von Ense

The Memoirs of Alexander Herzen, Parts I and II

Dr. Southwood Smith: A Retrospect

A Discourse on the Life, Character and Writings of Gulian Crommelin Verplanck

The Adventure of Living : a Subjective Autobiography

A Friend From Beyond the Grave

Confessions of Boyhood

The Memoirs of Victor Hugo