Foreword by the researcher-historian Potitsa Grigorakou , Dr. of the Sorbonne University.

The short treatise of Theophrastus "His with the natural" is perhaps the only one of his many works that has raised many questions regarding the physical and metaphysical concepts it contains. This treatise has been divided by its later scholars into 9 concise and difficult to understand sections. The essay raises many interesting questions, but nowhere does it appear that Theophrastus has a better answer than the views of the Presocratic philosophers he criticizes. Theophrastus keeps his distance from the principles of the various philosophical Schools. His opinions are those of a high school fan. But he is able to criticize the Aristotelian system and in particular some of its weakest points.

In this essay, Theophrastus also notes the reactions of the physicist Aristotle to the metaphysical assumptions of the philosopher Plato .