 Natural philosophy, according to Averroes (following Aristotle), embraces the study of all sensible beings that undergo change and possess the principle of motion and rest in themselves (LC 1G Proemium). The philosophy of natural beings divides into various branches, for instance, psychology or astronomy. Physics is the first and most important branch and since it is scientific knowledge physics has to inquire about causes, and its distinctive causes are “the causes common to all natural entities” (LC 1G). Averroes follows Aristotle and distinguishes four causes—matter, form, purpose and agent—in all natural beings. Physics extends the inquiry on matter and agent to their outmost limits, that is, Prime Matter and the First Mover. Another part of philosophy deals with primary form and first purpose, and this is metaphysics. Averroes adds other aspects to the subject matter of physics, he calls them “accessories”, “necessary concomitants” (lawāḥiq, consequentes) or properties common to all natural beings, namely place, time and the like (LC 1GH; MC 434AE).