the tree of hippocrates, under which hippocrates — the "father of medicine" — taught at kos, is reputed to have been an oriental plane. a 500-year-old tree presently there may be on the same site and may have been planted from a succession of cuttings from the original. the athenian academy, outside athens, featured a sacred grove of planes where the students listened to the masters and where among others the peripatetics practiced philosophy.