Theophrastus, a Greek native of Eresos in Lesbos, was the Peripatetic School counterpart to Aristotle. At a young age he came to Athens and initially enrolled in the school of Plato. Upon Plato's passing, he was close to Aristotle who in his works took Theophrastus. As Aristotle escaped from Athens Theophrastus took over as the Lyceum's head. For thirty-six years theophrastus ruled over the Peripatetic Academy, during which time the academy was thriving greatly. For his works on plants he is sometimes considered the founder of botany. After his death he was honoured with a lavish funeral by the Athenians. His replacement as the school's head was Lampsacus Strato. Theophrastus 'interests were broad and ranged from biology and physics to ethics and metaphysics. His two extant botanical works, and On the Causes of Plants, were a significant influence on science of the Renaissance. On Moral Characters, On Sense Perception, On Rocks, and Fragments on Physics and Metaphysics also remain surviving plays. He studied grammar and language in philosophy, and continued the study of Aristotle on logic. He often found space to be the pure organisation and location of bodies, time to be an incident of motion, and motion as a necessary consequence of all operations. In philosophy, he saw pleasure as both dependent on external forces and morality. Diogenes Laërtius Lives and Opinions of Eminent Philosophers provided much of the biographical detail on Theophrastus, writing more than four hundred years after Theophrastus's death. He came originally from Lesbos, Eresos. His name was Tyrtamus, but later he was known by the pseudonym Theophrastus, which Aristotle has given him, it is said, to signify the elegance of his speech. Aristotle, Theophrastus, and Lampsacus Strato. He travelled to Athens, where he may have taught under Plato, after taking training in philosophy from one Alcippus at Lesbos. He and Aristotle became friends, and Plato died. In his self-imposed exile from Athens theophrastus may have followed Aristotle. When Aristotle travelled on Lesbos to Mytilene in 345, at Theophrastus 'suggestion it is quite possible that he did so. It would appear that it was on Lesbos that Aristotle and Theophrastus started their natural science studies, with Aristotle studying animals and plants studying theophrastus. Since Aristotle was appointed mentor to Alexander the Great in 343, theophrastus presumably followed Aristotle to Macedonia. About 335 BC, Theophrastus travelled to Athens with Aristotle where Aristotle started to lecture at the Lyceum. When the anti-Macedonian feeling forced Aristotle to flee Athens after Alexander's death, Theophrastus remained behind as head of the Peripatetic Academy, a position he continued to hold after Aristotle's death in 322. In his will, Aristotle made him guardian of his sons, including Nicomachus, with whom he had been close. Similarly, Aristotle legated his library and the originals of his works to him, and named him his successor at the Lyceum. Eudemus of Rhodes also had certain rights to this position and it is said that Aristoxenus had resented Aristotle's decision. He studied general history but his primary interests in natural history were to follow Aristotle's labours. This is evidenced not only by a number of treatises on particular zoological subjects, of which only parts exist besides the names, but also by his books On Minerals, his Enquiry into Plants, and On the Causes of Plants. The Enquiry into Plants was initially ten volumes, nine of which survive. The research is organised into a structure whereby plants are categorised according to their processing types, positions, proportions, and functional uses such as meats, juices, herbs, etc. The first book deals with plant parts; the second book deals with plant reproduction and sowing times and methods; the third, fourth and fifth books devoted to trees, their forms, locations and practical applications; the sixth book deals with shrubs and spiny plants; the seventh book deals with herbs; the eighth book deals with plants growing edible seeds.