1
The immortality of unicellular beings is not at any time absolute, but only potential.
2
From this it follows that these unicellular beings are immortal.
3
Everything else belongs to unicellular beings.
4
All unicellular beings, such as the protozoa and the simpler algæ, fungi, etc., reproduce themselves by means of simple fission.
5
In the beginning, there existed no other animal organisms than these aggregations of similar unicellular beings, all of which reproduced themselves.