For example...

For example, when a plant withers and turns to dust, does the form of dust actually exist in the form of the plant and remain with that same actuality, or in the earlier circumstances was there only a complete vegetable form and with its passing does the form of dust newly appear?

Regarding the case of the detachment of the animal or human spirit from the animal or human body, do the materials actually exist previously, and after separation of the spirit do they remain with the same previous actuality, or in the previous circumstances is actuality restricted to the spirit and after its detachment new forms freshly appear?

Therefore, that which these discussions pivot upon regarding these types of change is whether the presence of two forms in a single existent is allowed or not. That is, if the presence of two forms in the later existent is allowed, types four and fourteen are considered to be a kind of generation without corruption, and if the presence of two forms in the earlier existent is allowed, then types five and fifteen will be considered cases of corruption without generation.

However, if the presence of two forms is impossible, all of these types will be cases of generation and corruption. Some philosophers do not allow the presence of two forms in a single thing and have reasoned…