Footnote 66:

Changed to parvus mundus in the 1555 edition. The word “microcosm,” unattested in ancient Greek or Latin, is a medieval Latin compound from Greek roots. But the view of the human body as an epitome of the universe goes back at least as far as the Hippocratic writings, and persists in such words as “region” to denote an anatomical area. It is thought that the term micros cosmos was first applied to man by Democritus; see F.M. Cornford’s note on Aristotle Physics 252b26 (Loeb edn.), and W.K.C. Guthrie, II p. 471.