Aristotle 
On Generation and Corruption 

OUR next task is to study coming-to-be and passing-away. We are to distinguish the causes, and to state the definitions, of these processes considered in general-as changes predicable uniformly of all the things that come-to-be and pass-away by nature. Further, we are to study growth and ‘alteration’. We must inquire what each of them is; and whether ‘alteration’ is to be identified with coming-to-be, or whether to these different names there correspond two separate processes with distinct natures.