  “Anticipation of nature” resembles “conventionalism” (Urbach 1987, 30–41), according to which theories refer to unobservable entities (e.g., atoms, epicycles). The theories are “computation rules” or “inference licences” within this given framework, which give explanations and predictions of particular kinds of observable events. The conventionalist acceptance of making predictions concerning future events cannot be separated from the question of probability. Bacon's procedure of knowledge acquisition goes against “conventionalism”, because “anticipation of nature” does not reject authoritative and final speculations concerning “unobservables” and because it permits “ad hoc adjustments”.  Nowadays, however,