- Manhood of Humanity.
- Menschliches, Allzumenschliches: Ein Buch Fuer Freie Geister
- On Some Fossil Remains of Man
- On the Relations of Man to the Lower Animals
- The Destiny of Man, Viewed in the Light of His Origin
- The Works of Aristotle the Famous Philosopher: Containing his Complete Masterpiece and Family Physician; his Experienced Midwife, his Book of Problems and his Remarks on Physiognomy
- Thoughts on Man, His Nature, Productions and Discoveries: Interspersed with Some Particulars Respecting the Author