| # | Title | Artist | Length |
|---|
| 1 | Natural Selection - Divergence of Character 1 | Charles Darwin | 5:00 |
| 2 | Natural Selection - Divergence of Character 2 | Charles Darwin | 5:17 |
| 3 | Natural Selection - Divergence of Character 3 | Charles Darwin | 3:39 |
| 4 | Difficulties on Theory | Charles Darwin | 1:27 |
| 5 | Difficulties on Theory - Absence or rarity of transitional varieties | Charles Darwin | 1:53 |
| 6 | Difficulties on Theory - Transitions of Organic beings 1 | Charles Darwin | 5:45 |
| 7 | Difficulties on Theory - Transitions of Organic beings 2 | Charles Darwin | 4:59 |
| 8 | Difficulties on Theory - Organs of extreme perfection 1 | Charles Darwin | 6:02 |
| 9 | Difficulties on Theory - Organs of extreme perfection 2 | Charles Darwin | 3:31 |
| 10 | Difficulties on Theory - Organs of small importance 1 | Charles Darwin | 4:51 |
| 11 | Difficulties on Theory - Organs of small importance 2 | Charles Darwin | 5:49 |
| 12 | Instinct 1 | Charles Darwin | 7:55 |
| 13 | Instinct 2 | Charles Darwin | 4:38 |
| 14 | Instinct - Slave-making instinct 1 | Charles Darwin | 6:54 |
| 15 | Instinct - Slave-making instinct 2 | Charles Darwin | 3:21 |
