  Bacon's new mode of using human understanding implies a parallelism between striving towards human power and constituting human knowledge. Technical know-how leads to successful operations, which converge with the discovery of forms (Pérez-Ramos 1988, 108; Bacon IV [1901], 121). To understand the workings of nature presupposes an arrangement of facts which makes the investigative analysis of cause and effect possible, especially by means of new experiments. At this point the idea of scientia operativa comes in again, since the direction for a true and perfect rule of operation is parallel to the discovery of a true form. Bacon's specific non-Aristotelian Aristotelianism (Pérez-Ramos 1988, 113, 115) is one of the main features of his theory. Other indispensable influences on Bacon, apart from a modified version of Aristotle, are critically assessed Hermeticism, rhetoric (Vickers) and alchemy (Rees).