Aristotle's Theophrastus

Theophrastus was a partner in aristotle's biological investigations on the island of lesbos. Theophrastus seems to have been concerned to fill out and complete aristotle's natural philosophy by explaining features of the inanimate world. For instance, he wrote about the causes of dizziness and sweat. His master had not left only a body of texts, but implicitly a whole research programme that could be pursued by his students.