1. Life and Letters of Charles Darwin, Volume I
2. Life and Letters of Charles Darwin, Volume 2
3. The Autobiography of Charles Darwin
4. Expression of Emotion in Man & Animals
5. The Voyage of the Beagle
6. On the Origin of Species
7. Origin of Species, 6th Edition
8. Formation of Vegetable Mould
9. The Descent of Man
10. Darwin and Modern Science by A C Seward
11. The Reception of the Origin of Species by T H Huxley
12. T H Huxley's On the Brain