Indeed, the constant renewal of the matter of every organism is also to be regarded as merely the manifestation of this continual pressure and change, and physiologists are now ceasing to hold that it is the necessary reparation of the matter wasted in motion, for the possible wearing out of the machine can by no means be equivalent to the support it is constantly receiving through nourishment.
Areago, ahalegin eta aldaketa iraunkor horren agerpen soil ikusi behar da organismo ororen materiaren etengabeko berritzea ere, zeinari fisiologoek utzi baitiote orain, higiduran erabilitako gaiaren ordezko beharrezkotzat hartzeari, zeren makinaren higapen posiblea inondik ere ez baita elikaduraren bitartezko etengabeko gehikuntzaren baliokidea: