Tags: Poem.
For other philosophical literature by the same name see On Nature (disambiguation).On Nature was a philosophical poem which details Anaximander’s theories about the evolution of the Earth plants animals and humankind. Anaximander described his theory that humans and other animals descended from fish once the world’s oceans began to dry up. Also he described a theory of abiogenesis in his book in the way that he believed that the first life forms formed from mist.