These two volumes represent the first fruits of an international project to produce a new collection - text, translation and commentary - of the fragments and testimonia relating to Theophrastus (c370-288/5 BC), Aristotle’s pupil and successor as head of the Lyceum. The need for a new collection was apparent: the standard collection, by Wimmer, is already 120 years old, whereas we now have far better texts of many of the ancient authors in which fragments and testimonia of Theophrastus occur. Whilst classicists have devoted the past hundred years to bringing into the light the work of the major post-Aristotelian schools, the contribution of Theophrastus has remained obscure. This first stage of the project presents the texts, critical apparatus and English translation of the fragments and testimonia. It contains a long methodological introduction, an index of Theophrastean texts and concordances with other collections (Scheider, Wimmer and the several recent partial editions).