[A]ll true and frutefull Natvrall Philosophie, hath A double Scale or Ladder, Aſcendent and Deſcendent, aſcending from experiments to the Inuention of cauſes; and deſcending from cauſes, to the Inuention of nevve experiments; Therefore I iudge it moſt requiſite, that theſe tvvo parts be ſeuerally conſidered and handled.
Source: wiktionary