For each of these marks off a certain class of things for itself and busies itself about this as about something existing and real,-not however qua real; the science that does this is another distinct from these.
baina zientzia bakoitzak ez du generoa ikertzen generoa den zerbait den aldetik, den-a den aldetik ikertzen duena bestelako zientzia bat baita, zientzia haietaz apartekoa.