ON GENERATION AND CORRUPTION

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.

On this question, indeed, the early philosophers are divided. Some of them assert that the so-called 'unqualified coming-to-be' is 'alteration', while others maintain that 'alteration' and coming-to-be

are distinct. For those who say that the universe is one something
(i.e. those who generate all things out of one thing) are bound to
assert that coming-to-be is 'alteration', and that whatever
'comes-to-be' in the proper sense of the term is 'being altered':
but those who make the matter of things more than one must distinguish coming-to-be from 'alteration'. To this latter class belong

Empedocles, Anaxagoras, and Leucippus. And yet Anaxagoras himself failed to understand his own utterance. He says, at all events, that coming-to-be and passing-away are the same as 'being altered':' yet,
in common with other thinkers, he affirms that the elements are

many. Thus Empedocles holds that the corporeal elements are four, while all the elements-including those which initiate movement-are six in number; whereas Anaxagoras agrees with Leucippus and Democritus that the elements are infinite.�