 Diogenes attributes to Theophrastus well over two hundred separate treatises in different styles, of varying length and on a very wide range of topics, totaling 232,808 lines; of these less than ten per cent survives. Some works seem to have been intended for use within the school as basis for Theophrastus’ lectures, while others were intended for a wider audience and they were, therefore, written in a popular style or in dialogue form. Judging from the surviving material and from their titles, some works were on the same topics as ones by Aristotle, whereas others seem to have dealt with topics related to those of the Aristotelian treatises but not covered by them.