He is said to have written upwards of 400 books , but they have all perished .
He was the teacher of Zeno of Sidon , who succeeded him as the head of the school , about 100 BC .
teacher is said to have written upwards of 400 books , but they have all perished .
He was the teacher of Zeno of Sidon , who succeeded him as the head of the school , about 100 BC .