(6) Apart from the great difficulty of stating the case truly with regard to these matters, it is very hard to say, with regard to the first principles, whether it is the genera that should be taken as elements and principles, or rather the primary constituents of a thing; e.g. it is the primary parts of which articulate sounds consist that are thought to be elements and principles of articulate sound, not the common genus-articulate sound;
Esate baterako, soinu artikulatuaren osagaiak eta printzipioak, soinu artikulatuak osatzen dituzten lehen osagai horiek omen 25) dira, baina ez soinu artikulatua genero bezala hartuta.