Forms and the analysis of change
You have just provided Aristotelian analyses in terms of matter and form of two natural phenomena yourself: a piece of wood reducing to ashes, and a red apple turning brown. In this article, we will briefly look at these two cases in some more detail.
i. When a piece of wood reduces to ashes, the Aristotelian scholastics would say this is a process where one substance (the piece of wood) ceases to be, and another one comes into existence. We are dealing with a case of substantial change, that is. In a substantial change, the matter of the substance that ceases to be gets reconfigured by the form of the substance that comes into existence. In this case, then, the matter of the piece of wood loses the form that gave it the nature of wood, and acquires the form of ash instead.
ii. When a red apple turns brown. the apple changes, but survives the process. The apple that was red at first, is the same as the apple that is now brown. We are dealing with a case of accidental change, therefore. In an accidental change, a substance retains its matter and substantial form. It undergoes a change, however, on the level of its accidental forms. In this case, the apple first had an accidental form that made it red, but lost this form in the course of time. In its place, it acquired an accidental form that made it brown.
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