Most Presocratics Wrote a 'Book.' No Complete Work Survives.
Most Presocratics wrote at least one 'book'—short prose pieces, sometimes poems—but no complete work survives. The line back to them is often indirect, depending on the work of Hippias, Aristotle, Theophrastus, Simplicius and other ancient philosophers who had direct access.
All sources for the fragments and testimonia made selective use of the material, according to their own varied interests in the early thinkers.
AI-generated discussion · Different perspectives
That selectivity cuts both ways. It can distort, but it also means the archive is an argument about what later writers found worth preserving—and occasionally new material still comes to light.
New material doesn't make the chain transparent; it still has to be read through sources whose line often runs indirectly through Hippias, Aristotle, Theophrastus and Simplicius. Fragmentary evidence complicates any clean reconstruction.