Str. But, my boy, this is not yet completely stated; for the man who is engaged in the first part of the making of clothes appears to do something the opposite of weaving.
Y. Soc. How so?
Str. The process of weaving is, I take it, a kind of joining together.
Y. Soc. Yes.
Str. But the first part I refer to is a separation of what is combined and matted together.
Y. Soc. What do you mean?
Str. The work of the carder’s art. Or shall we have the face to say that carding is weaving and the carder is a weaver?
Y. Soc. No, certainly not.
Str. And surely if we say the art of making the warp or the woof is the art of weaving, we are employing an irrational and false designation.
Y. Soc. Of course.
Str. Well then, shall we say that the whole arts of fulling and mending are no part of the care and treatment of clothes, or shall we declare that these also are entirely included in the art of weaving?
Y. Soc. By no means.
Str. But surely all these will contest the claim of the art of weaving in the matter of the treatment and the production of clothes; they will grant that the part of weaving is the most important, but will claim that their own parts are of some importance, too.
Y. Soc. Yes, certainly.
Str. Then we must believe that besides these the arts which produce the tools by means of which the works of weaving are accomplished will claim to be collaborators in every work of weaving.
Y. Soc. Quite right.
Str. Will our definition of the art of weaving (I mean the part of it we selected) be satisfactory if we say that of all the activities connected with woollen clothing it is the noblest and the greatest? Or would that, although it contains some truth, yet lack clearness and completeness until we separate from weaving all these other arts?
Y. Soc. You are right.
Str. Then shall our next move be to do this, that our discussion may proceed in due order?
Y. Soc. Certainly.
Str. First, then, let us observe that there are two arts involved in all production.
Y. Soc. What are they?
Str. The one is a contingent cause, the other is the actual cause.
Y. Soc. What do you mean?
Str. Those arts which do not produce the actual thing in question, but which supply to the arts which do produce it the tools without which no art could ever perform its prescribed work, may be called contingent causes, and those which produce the actual thing are causes.
Y. Soc. At any rate, that is reasonable.
Str. Next, then, shall we designate all the arts which produce spindles, shuttles, and the various other tools that partake in the production of clothing as contingent causes, and those which treat and manufacture the clothing itself as causes?
Y. Soc. Quite right.