Of impending disorders there are many signs, in explaining which I shall not hesitate to make use of the authority of ancient men, and especially of Hippocrates; for although more recent practitioners have made some changes in methods of treatment, they allow none the less that the ancients prognosticated best. Before I note, however, those preceding symptoms which suggest fear of disease, it does not seem unfitting to set out: the seasons of the year (1, 1‑2), the sorts of weather (1, 3‑4), periods of life and temperaments which may be in particular safe or open to risks (1, 5), and what kind of disorders is most to be apprehended in each (1, 6‑23). Not that men may not sicken and die at any season, in any sort of weather, at any age, whatever their temperament, from any kind of disease, but since certain kinds occur less . . . but some kinds occur more often, so it is of use that everyone should recognize against what, and when, he should be most on his guard.