“ He wrote works entitled Analytica, Categoriae and De interpretatione, which were either paraphrases or critical commentaries, and seem to have added little to Aristotle's own writings. Alexander of Aphrodisias refers to a work πρὸς Διόδωρον, and Athenaeus quotes from another treatise, Against the Sophists. Outside philosophy, he and Theophrastus carried on the physical investigations of Aristotle, Athenaeus frequently quotes from a work on botany which manifests great care in definitions and accuracy of observation. ”