Of the Shortness of Life By: Lucius Annaeus Seneca

Omega: The Last Days of the World By: Camille Flammarion

On War By: Carl von Clausewitz

Oscar Wilde: Art and Morality. A Defence of The Picture of Dorian Gray By: Unknown

Our Knowledge of the External World: As a Field for Scientific Method in Philosophy By: Bertrand Russell

Pagan & Christian Creeds: Their Origin and Meaning By: Edward Carpenter

Passages from the Life of a Philosopher By: Charles Babbage

Pep: Poise, Efficiency, Peace By: William C. Hunter

Phenomenology of Mind, Volume 2 By: Georg Wilhelm Friedrich Hegel

Philebus By: Unknown

Philosophy of Logical Atomism By: Bertrand Russell

Philosophy of the Plan of Salvation By: James Barr Walker

Physics By: Aristotle

Posthumous Essays of John Churton Collins By: John Churton Collins

Pragmatism By: William James

Principia Ethica By: George Edward Moore

Privilege of Pain By: Caroline Kane Mills Everett

Proposed Roads to Freedom By: Bertrand Russell

Protagoras By: Plato (Πλάτων)

Quatrains of Omar Khayyam of Nishapur By: Omar Khayyám

Quiet Talks about Jesus By: Samuel D. Gordon

Quintessence of Ibsenism By: George Bernard Shaw

Religion and Science from Galileo to Bergson By: John Charlton Hardwick

Republic (version 2) By: Plato (Πλάτων)

Riddle of the Universe By: Ernst Haeckel

Selected Public Domain Poems By: John Masefield

Series of Lessons in Raja Yoga By: William Walker Atkinson

Shri Dnyaneshwar - A Sketch Of His Life And Teachings By: Anonymous

Sikh Religion: its Gurus, Sacred Writings and Authors, Volume 6 By: Max Arthur Macauliffe

Some Problems of Philosophy By: William James

Sree Krishna, The Lord of Love By: Baba Premanand Bharati

Ten Days in the Light of Acca By: Julia M. Grundy