They are not like extremes that keep to themselves something positively fixed, and merely transmit an external property to one another through their common medium and by external contact: they are what they are solely in this medium and in their contact with each other.
Ez dira mutur gisa, zerbait higiezin bezala eurentzat gordetzen duten eta kanpoko ezaugarri bat erdigunera eta ukitzera elkarri bidaltzen dioten mutur gisa; baizik eta diren hori, erdigune horretan eta ukitze horretan bakarrik dira.