<Li> Causes Concerned with Seeds and Plants and Fruits </Li> <Li> Causes Concerned with Animals (three books) </Li> <Ul> <Li> On Different Angles or On contact of Circles and Spheres </Li> <Li> On Geometry </Li> <Li> Geometry </Li> <Li> Numbers </Li> <Li> On Irrational Lines and Solids (two books) </Li> <Li> Planispheres </Li> <Li> On the Great Year or Astronomy (a calendar) </Li> <Li> Contest of the Waterclock </Li> <Li> Description of the Heavens </Li> <Li> Geography </Li> <Li> Description of the Poles </Li> <Li> Description of Rays of Light </Li> </Ul> <Li> On Different Angles or On contact of Circles and Spheres </Li>

When did democritus claim atoms could not be split