his "occulta naturae miracula", a book of secrets, is his best-known work. it ran through many editions and was widely translated from latin. it drew on classical sources, particularly aristotle. lemnius was influenced, too, by the "airs, waters, places" doctrine from the hippocratic corpus. the work attempted to reconcile natural philosophy as found in classical sources with christian doctrine, particularly on generation and reproduction, while emphasising extraordinary aspects. his humoral theory was complex, with phlegm being divided into four, and the other humours also being subdivided.